Fossiliferous shale

The Stoner maintains these characteristics southward to northern Anderson County. At the Mont Ida section (Fig. 3C), it is thickened to about 25 feet, with the lower 8 feet transitional downward to "Eudora" gray fossiliferous shale, and the upper 12 feet developed as a massive phylloid-algal limestone typical of the algal-mound facies belt.

Rocks in the Schuler pool, Union Co, AR described: 1) basal 100 ft sand[stone] zone called the Jones sand; scattered pebbles occur at the base of the sand[stone] which is dense, calcareous, and shaly, upper part of the Jones is porous; the basal sand[stone] is succeeded upwards by 2) 20 ft of gray shale; 3) 490 ft of massive, fine to coarse ...It is composed largely of fossiliferous limestones and thin beds of red and gray shale. The general lithology and part of the fusulinid faunas are indicated in the accompanying diagram (Fig. 5). Detailed descriptions of the individual units are given at the end of the report.This photograph illustrates two fossiliferous shale beds in the lower Bartolo Member of the Atrasado Formation (white arrows). The shales contain a sparse, allochthonous flora of mixed seasonally ...Therefore, the estimated age of the fossiliferous dolomitic shales from BIIc8 is between ca. 810 and 715 Ma. Fig. 1 Textures and structures observed via light or scanning electron …The upper 2 feet is blue-gray, massive limestone, commonly conspicuously pitted and faded to light gray by weathering. It is underlain by about 2 feet of red and green shale. The rock in the lower part (about 7 feet) is buff and gray thin-bedded limestone, the lowermost part of which is nodular and contains fossiliferous gray shale. Stearns ShaleThe meaning of FOSSILIFEROUS is containing fossils. Recent Examples on the Web Alas, quarrying explosives had blown apart the fossiliferous layers of rock, splintering many of the bones. — Gemma Tarlach, Discover Magazine, 19 Dec. 2018 The material came from the famously fossiliferous Aust Cliff, and, like the Somerset specimen, is from the Late Triassic's Rhaetian Age, about 201-208 million ...

The only difference between mudstone and shale is that mudstones break into blocky pieces whereas shales break into thin chips with roughly parallel tops and bottoms. Both are made of ancient mud. From the point of view of understanding the ancient conditions of sediment deposition, it is more useful to subdivide mud rocks into siltstone and ...alternating grey fossiliferous shale and sandstone. In addition to Callixylon, the new outcrop has yielded compression fossils representing cladoxylopsidtrunks,pyritizedremains of woody cladoxylopsids and of stenokolean axes of Crossia Beck and Stein, and a large number of as yet unidentifiedcompressions(GerrienneandMeyer-Berthaud,2006,2010;The shale content of the Grant Lake Limestone progressively increases between Maysville, KY, and Cincinnati, OH. The term Grant Lake Formation is used where the unit becomes predominantly shale (50 to 60%). The Grant Lake Formation is divided into (ascending) Bellevue, Corryville, and Mount Auburn Members. Name is applied in Butler, Hamilton ...1. Pink sandstone in thin beds. 27. Massive layer of gray to buff sandstone. 6. Calcareous shale in massive layers, containing more or less grit, with a few intercalated thin layers of fine-grained sandstone. 155. Heavy bed of dense gray limestone, with chert lenses and nodules. 4.Fossiliferous shale matrix. Click here for a more detailed list of fossils from this site. 〉 Waco Mammoth National Monument is a national park were we will learn about “Ice Age” Texas and view Colombian Mammoth …

Choose one: A. chalk B. micrite C. chert D. fossiliferous limestone The organic sedimentary rock that is composed of mud-sized particles and partially decayed organic matter derived from plankton and algal remains is called Choose one: A. oil shale. В. сoal. C. chert. D. fossiliferous limestone. Identify the true statement.The Grove Church Shale (Swann, 1963, p. 44-45), the uppermost formation in the Chesterian Series in Illinois, is named for Cedar Grove Church, ... The Grove Church is a gray, fossiliferous shale and includes interbedded fossiliferous limestone. It was originally part of the Kinkaid Formation, but it was split off because it is dominantly shale.In Bibb County and southwestern Shelby County, the Conasauga consists of medium-bluish-gray fine-grained, thin-bedded argillaceous limestone and interbedded dark-gray shale. In the eastern Valley and Ridge the lower part includes dark-green to pale-olive fossiliferous shale with a few dark-gray limestone interbeds.Shale forms from the pressure of layers of sediment compressing bits of silt that settle into the clay on the bottom of bodies of water. The compressed clay and silt become shale over time. Shale is a sedimentary rock.Geochemical evidence for oxygenated bottom waters during deposition of fossiliferous strata of the Burgess Shale Formation December 2003 Palaeogeography Palaeoclimatology Palaeoecology 201(3):249-268

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fossiliferous shale. A Brief Overview of the Cretaceous Mancos Shale in Northeastern Arizona and its Hydrocarbon Potential. Basic Information. ... Shale and limestone formations that contain hydrocarbons without sufficient porosity and permeability to yield oil and gas with conventional drilling techniques are being reconsidered in light of ...Rocks in the Schuler pool, Union Co, AR described: 1) basal 100 ft sand[stone] zone called the Jones sand; scattered pebbles occur at the base of the sand[stone] which is dense, calcareous, and shaly, upper part of the Jones is porous; the basal sand[stone] is succeeded upwards by 2) 20 ft of gray shale; 3) 490 ft of massive, fine to coarse ...Shale is very susceptible to physical weathering due to the ease with which it breaks into planes. However, when buried under the Earth’s surface, shale’s fine-grained matrix can prevent liquids from seeping past, and consequently, shale has held important roles in natural gas and oil exploration. Rock salt Figure 3.6.10. Rock Salt/Halite.Carlile Shale (Upper Cretaceous) at surface, covers 52 % of this area. Dark-gray to black, silty to sandy shale with several zones of septarian, fossiliferous, carbonate concretions. Contains up to three sandstone units in the upper portion of the formation and sandy calcareous marl at the base. Thickness up to 330 ft (100 m).D. shale. Which of the following rock types does not contain the mineral calcite? A. chalk B. chert C. fossiliferous limestone D. micrite . The organic sedimentary rock that is composed of mud-sized particles and partially decayed organic matter (kerogen) derived from plankton and algae remains is.

For American frackers that survive, a light is on the horizon. Chesapeake Energy Corp filed for bankruptcy on June 28, ending the pioneer’s run leading the US shale oil and gas industry. Founded in 1989, Chesapeake binged on debt to acquire...The Kope Formation in north-central KY and southwestern OH consists of fossiliferous shale interbedded with medium bedded, fossiliferous limestone and siltstone. In southeastern IN, the Kope consists of bluish- to brownish-gray clay-shale and minor limestone. Fossils include brachiopods, bryozoans, crinoids, trilobites, and mollusks.The only difference between mudstone and shale is that mudstones break into blocky pieces whereas shales break into thin chips with roughly parallel tops and bottoms. Both are made of ancient mud. From the point of view of understanding the ancient conditions of sediment deposition, it is more useful to subdivide mud rocks into siltstone and ...It is fitting to recognize these strata as a formation, as they comprise limestone and fossiliferous shale between the underlying varicolored Roca shale and the overlying varicolored Eskridge shale. The type exposure of the Grenola formation is 4 to 5 miles west of Grenola in Elk county, Kansas. Condra and Busby gave names to the parts of the ...Green, silty, glauconitic and fossiliferous shale occurs at the core of all Fort Payne buildups (Fig. 1). Krause and Meyer (2004) combined green shales within mounds with green-gray shales above the mounds into the same facies, but herein the shales are subdivided as a separate facies similar to (but slightly different from) the green shale …Colorado Pierre Shale Fossils. The Pierre Shale is an upper Cretaceous marine formation, which is well known for its ammonite fossils. Most of the fossils below were found in Boulder and Pueblo Counties. A very complete and up-to-date reference for the ammonites and nautiloids of the Pierre Shale is Ammonites and the Other Cephalopods of the ...The St John's Group is a fossiliferous shale-dominated Ediacaran geologic group in Newfoundland and Labrador, younger than 565 ± 3 million years ago.Catskill Formation (Devonian) at surface, covers 9 % of this area. Grayish-red sandstone, siltstone, shale, and mudstone; units of gray sandstone occur in upper part; lithologies in upper part arranged in fining-upward cycles. In the Altoona area, the Catskill Formation is mapped as the Duncannon, Sherman Creek, and Irish Valley Members, which ...

shale 620 Clay or clay shale 621 Cherty shale 622 Dolomitic shale 623 Calcareous shale or marl 624 Carbonaceous shale 625 Oil shale 626 Chalk 627 Limestone 628 Clastic ... Fossiliferous bedded chert 659 Bony coal or impure coal 660 Underclay 661 Flint clay 662 Bentonite 663 Glauconite 664 Limonite 665 Siderite 666 Phosphatic-nodular rock 667 ...

Pg. 65. Calhoun shale of Shawnee group. Clayey and sandy shale with minor amount of limestone and one or more coal beds. In northern Kansas a thin coal bed and much sandstone, a part of which fills channels, occur near top of formation. Dark-gray silty fossiliferous shale comprises lower part, and plant remains occur in sandy part.Cuyahoga Valley National Park has a rich geologic history. It wasn’t always the picturesque valley that can be seen today. It was formed over many millions of years, with the help of oceans, glaciers, and rivers. The oldest exposed rocks in the park formed about 400 million years ago, and the valley is still being shaped and changed today by the …Peat Rock Salt (halite) Sandstone Shale Siltstone. Basic Classification - Method of Origin. Clastic. Breccia Conglomerate Sandstone Shale Siltstone. Chemical. Chert Dolomite Gypsum Halite (rock salt) Limestone - micrite Limestone - oolitic Limestone - intraclastic Rock Salt (halite) Biochemical. Chalk Coal - bituminous Coal - anthracite Coquina ...Geochemical evidence for oxygenated bottom waters during deposition of fossiliferous strata of the Burgess Shale Formation December 2003 Palaeogeography Palaeoclimatology Palaeoecology 201(3):249-268Shale is a laminated or fissile clastic sedimentary rock that composed of predominance of silt and clay other minerals , especially quartz and calcite. Characteristic properties of shale is breaks along thin laminae or parallel layering or bedding called fissility. It is most abundant sedimentary rock. The composition (silt and clay) of shale ...slightly calcareous, fossiliferous. SHALE; light gray to tan, silt y; inter— bedded with reddish—tan very fine grained, micaceous sandstone, and dark gray shale. SILTSTONE; medium to dark gray, argil— laceous to sandy; thinly interbedded with medium grained, tan sandstone , and dark gray carbonaceous shale . COAL; Crevasse Canyon Dilco zoneThe table below includes specific environments where various types of sediments are deposited and common rocks, structures, and fossils that aid in deducing the depositional environment from examining a sedimentary rock outcrop. Although this is not a complete list, it is a good introduction to depositional environments. Continental. Transitional.

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shale, which, in its lower part, yields a few shells, such as Nuoulaf. Leda, and Idngula—species which are rarely found in the lower fossiliferous shale-bed.Pg. 65. Calhoun shale of Shawnee group. Clayey and sandy shale with minor amount of limestone and one or more coal beds. In northern Kansas a thin coal bed and much sandstone, a part of which fills channels, occur near top of formation. Dark-gray silty fossiliferous shale comprises lower part, and plant remains occur in sandy part.Interval includes Sweetland Creek Shale in southeast Iowa, and “Amana beds” of Iowa County. Lime Creek Fm onlaps eroded Ordovician surface in northwestern Iowa. Primary Lithologies: shale, gray to green-gray, dolomitic to calcareous; limestone, variably argillaceous, fossiliferous, part biostromal; dolomite, variably argillaceous, part ...Interval includes Morgan School, Mouse Creek, Labette, Pawnee, Bandera, Altamont, Nowata, Lenapah, Memorial, Lost Branch formations. Primary Lithologies: shale ...Keyser Formation through Clinton Group, undivided - Same as Keyser-through-Mifflintown (DSkm) interval, plus Clinton Group at base. Clinton includes the following, in descending order: Keefer Formation--fossiliferous sandstone and hematitic, oolitic sandstone and shale; Rose Hill Formation--fossiliferous shale.They consist of finely ground rock dust produced by the glacier. Few living things braved these arctic waters, either for living or swimming, and such clays are only sparsely fossiliferous. In contrast, clay quarries in Cenozoic, Mesozoic, or Paleozoic rocks are remarkably fossiliferous. Ammonites are found in Cretaceous shale pits of Dallas ...Choose one: A. chalk B. micrite C. chert D. fossiliferous limestone The organic sedimentary rock that is composed of mud-sized particles and partially decayed organic matter derived from plankton and algal remains is called Choose one: A. oil shale. В. сoal. C. chert. D. fossiliferous limestone. Identify the true statement.Shale, carbonaceous, grayish-black to black, fissile to platy, thin- to thick-laminated, locally fossiliferous and pyritic, locally contains phosphatic nodules in the upper part, locally has strong petroliferous odor (Henika, 1988); with beds and zones of medium-gray to greenish-gray, locally silty shale.Group or Formation Period Notes Almond Formation: Cretaceous: Almy Formation: Paleogene: Amsden Formation: Carboniferous: Arikaree Formation: Neogene: Ash Hollow FormationShale weathers rapidly to mud, which washes away leaving the fossils behind. There are three major Mississippian age fossiliferous shale units in north Arkansas. From oldest to youngest they are the Moorefield Shale; the Fayetteville Shale; and the Imo member of the Pitkin Formation. ….

Basal fossiliferous (mainly angiosperms) flaser-bedded sandstone are overlain by less-fossiliferous shale, siltstone and sandstone. Beds of glauconitic sandstone indicate shallow-marine to tidal-flat sedimentation. Thickness: About 60 m but thins over the Kharga uplift in the Baris area south of the Kharga Oasis.The only difference between mudstone and shale is that mudstones break into blocky pieces whereas shales break into thin chips with roughly parallel tops and bottoms. Both are made of ancient mud. From the point of view of understanding the ancient conditions of sediment deposition, it is more useful to subdivide mud rocks into siltstone and ...A shale bed above the sand wave unit is overlain by wave-ripple cross-laminated sandstone considered to have formed in an upper shoreface setting. An overlying fossiliferous shale with a restricted fauna and shell lag is interpreted as having been formed in a lagoon with restricted circulation.It is composed largely of fossiliferous limestones and thin beds of red and gray shale. The general lithology and part of the fusulinid faunas are indicated in the accompanying diagram (Fig. 5). Detailed descriptions of the individual units are given at the end of the report.Introduction to the Depositional Environments of the Trenton Group. Given the long period of geologic research on the Trenton Limestones, it is no surprise that extensive studies have been made of the the stratigraphy and sedimentology of these fossiliferous limestones. Nearly 150 years were dedicated to the study of the stratigraphy and ...fossils (e.g. fossiliferous limestone) ooliths; pellets; In contrast, the chemically-precipitated limestones consist solely of crystalline carbonates (e.g. microcrystalline limestone). The clastic limestones can be further subdivided according to their grainsize, much like other clastic sedimentary rocks. Other chemical sedimentary rocks16‏/07‏/2023 ... Inside one, some tiny eleganticeras ammonites from the Jurassic! If you'd like an ammonite rock to crack open, please message us directly on ...lithic wacke. Dominated by sand (1/16 to 2 mm), greater than 10% rock fragments, greater than 15% silt and clay, range of roundness and sorting possible. Mudrock. mudstone. Greater than 75% silt (1/256 to 1/16 mm) and clay (<1/256 mm), not bedded, well-sorted, grains too fine to judge roundness using hand lens. shale.Shale and interbedded limestone. Shale is gray, green, red, reddish brown, or maroon, sandy, calcareous, fossiliferous, locally fissile; several fissile black shale beds are in lower 75 feet. Interbedded dark- to light-gray, medium- to thick-bedded, argillaceous, cherty limestone beds are very fossiliferous and locally contain shale partings.In diesem Artikel werden die Entwicklung, die Konstruktion und die Eigenschaften, sowie die Betriebsergebnisse eines elektrischen Ofens von 12,7 cm inneren Durchmessers und 62 cm Lange behandelt. Die Achse des Ofens ist horizontal. Der Ofen kann ein Dutzend zylindrischer Proben vom Durchmesser 2,5 cm und der Hohe 2,1 cm oder Wurfel einer … Fossiliferous shale, Last we have shale, which is composed of clay particles and has a finely layered or fissile appearance. This extremely mature sedimentary rock is made from the smallest particles that can be carried by wind or barely moving water and can be found thousands of miles away from the original source., Table 5.3a. Rock densities and porosities. being in g/cm and or 0.23 when is in m/s or ft/s, respectively. The rule is valid for the major sedimentary rock types, but not for evaporites or carbonaceous rocks (coal, lignite). When a porous rock is saturated with a fluid, its density is given by the equation., black shale, also called Carboniferous Shale, variety of shale that contains abundant organic matter, pyrite, and sometimes carbonate nodules or layers and, in some locations, concentrations of copper, nickel, uranium, and vanadium. Fossils are rare in the shale and either are replaced by pyrite or are preserved as a film of graphite. Black shales occur in thin beds in many areas at various ..., Fossiliferous shale matrix. Click here for a more detailed list of fossils from this site. 〉 Waco Mammoth National Monument is a national park were we will learn about “Ice Age” Texas and view Colombian Mammoth …, ... fossiliferous limestone, mudstone, shale, travertine, rock gypsum. Stock Photo ID: 208952866. Copyright: PixelsAway. Crop, resize & add text to your image for ..., Shale and interbedded limestone. Shale is gray, green, red, reddish brown, or maroon, sandy, calcareous, fossiliferous, locally fissile; several fissile black shale beds are in lower 75 feet. Interbedded dark- to light-gray, medium- to thick-bedded, argillaceous, cherty limestone beds are very fossiliferous and locally contain shale partings., Chase Group (Permian) at surface, covers 49 % of this area. Limestone and shale. Limestone is light gray to dark gray, yellowish gray to pale yellowish brown. Two limestones in the upper part are thin bedded to medium bedded, argillaceous, cherty and fossiliferous; two limestones in the lower part are medium to massive bedded, very cherty, and …, Sedimentary Rocks. Sedimentary rocks (layered rocks) are made by the deposition of particles carried in air or water and by the precipitation of chemicals dissolved in water. These particles and chemicals come from the weathering (breaking apart in place) and erosion (carrying away and breaking apart while moving) of rocks on the Earth’s surface., 1. Sample 1 is called _____. a. Sandstone b. Limestone c. Rock Salt d. Shale e. Fossiliferous Limestone f. Conglomerate. 2. Sample 1 is an example of a _____. a. Clastic Sedimentary Rock 8 b. Chemical Sedimentary Rock c. Biochemical Sedimentary Rock. 3. Closely examine the individual grains in Sample 1., Sample S-2 is composed of calcium carbonate mud. Based on its appearance, it would most likely be called (a) Conglomerate (b) Oolitic Limestone (c) Fossiliferous Limestone () Coal (e) Shale (f) Coquina (g) Chert (h) Quartz Sandstone (1) Rock Salt () Breccia (K) Arkose Sandstone 7. Sample S-2 is an example of a (a) Clastic Sedimentary Rock (b ..., Lower part is medium-dark-gray, thin-bedded, siliceous, fossiliferous calcareous shale. Contains thin beds and lenses of medium-gray, fine-grained, highly fossiliferous, argillaceous limestone containing nodules, lenses and, locally, irregular beds of dark-gray chert. Lower contact abrupt and placed at top of calcareous quartz sandstone., Typically contains lenticular, orange to dark-red, fossiliferous limestone tempestites, rounded, non-fossiliferous ironstone concretions, and secondary, fibrous calcite partings. Additional discontinuous, thin-bedded sandstone and limestone beds are interbedded within this upper shale unit., Sequence becomes more shaly upsection. Approximately 30 m below the top of the Mifflintown, is a series of red beds termed the Rabble Run Member. The red shale is grayish red, calcareous, fossiliferous, and medium to thick bedded. The gray shale within the Member is medium gray, weathering to pale yellowish brown, noncalcareous, and …, Using the two well established fossiliferous horizons to split up the series, we obtain the following groups of beds :— The thicknesses given to the first three sections are of the series as developed at Glints, near Leighton Reservoir, Masham ; the thick­ ness of the Colsterdale fossiliferous horizon (Plate II.) appears to vary, The Legion shale member consists of 3 to 4 feet of fossiliferous shale. The top of this unit is black grading downward into tan and dark gray. The Burr limestone member is composed of two distinct limestone beds and a bed of shale between. The lower limestone is about 4 feet thick, massive, and is somewhat impure at the top and bottom., Rocks in the Schuler pool, Union Co, AR described: 1) basal 100 ft sand[stone] zone called the Jones sand; scattered pebbles occur at the base of the sand[stone] which is dense, calcareous, and shaly, upper part of the Jones is porous; the basal sand[stone] is succeeded upwards by 2) 20 ft of gray shale; 3) 490 ft of massive, fine to coarse ..., Also includes Tioga Metabentonite Bed - Brownish-gray, thinly laminated shale containing sand-size mica flakes; thickness less than one foot; and Needmore Shale - Olive-gray to black shale and dark, thin-bedded, fossiliferous, argillaceous limestone; thickness ranges from 70 to 145 feet., Expert-verified. Answer The correct answer is - D These three types of rocks i …. you see this outcrop and identify three types of rocks labeled in the image. You conclude that this sequence of rocks represent a O non conformity O regression O cross bedding O transgression Leavenworth Limestone Fossiliferous shale Conglomerate-sandstone., Expert Answer. Question 26 c. Oil Shale Oil shale is of mud sized particles. It is organic rich, mainly composed o …. QUESTION 26 The organic sedimentary rock that is composed of mud-sized particles and partially decayed organic matter derived from plankton and algae remains is: a. fossiliferous limestone, b. coal. Oc oil shale. d., and. Claire Parker. Updated February 18, 2022 at 8:15 a.m. EST | Published February 16, 2022 at 6:31 p.m. EST. Brazilian officials said on Feb. 17 that at least 117 people died after devastating ..., Peat Rock Salt (halite) Sandstone Shale Siltstone. Basic Classification - Method of Origin. Clastic. Breccia Conglomerate Sandstone Shale Siltstone. Chemical. Chert Dolomite Gypsum Halite (rock salt) Limestone - micrite Limestone - oolitic Limestone - intraclastic Rock Salt (halite) Biochemical. Chalk Coal - bituminous Coal - anthracite Coquina ..., The Jingshan assemblage is an important extension of the Burgess Shale-type biotas in China. Abstract. Burgess Shale-type biotas have been widely reported …, The McAbee fossil beds consist of 30 metres of fossiliferous shale in the Eocene Kamloops Group. The fossils are preserved here as impressions and carbonaceous films. We see gymnosperm (16 species); a variety of conifers (14 species to my knowledge); two species of ginkgo, a large variety of angiosperm (67 species); a variety of insects and ..., The Burgess Shale refers to a fossil-rich locality on Fossil Ridge between Wapta Mountain and Mount Field, just a few kilometres north of the small town of Field, British Columbia. Charles Walcott coined the term to describe various fossiliferous rock layers with soft-bodied preservation that he found in 1909 and 1910 and excavated for several ..., Using the two well established fossiliferous horizons to split up the series, we obtain the following groups of beds :— The thicknesses given to the first three sections are of the series as developed at Glints, near Leighton Reservoir, Masham ; the thick­ ness of the Colsterdale fossiliferous horizon (Plate II.) appears to vary, Black shale, variety of shale that contains abundant organic matter, pyrite, and sometimes carbonate nodules or layers and, in some locations, concentrations of copper, nickel, uranium, and vanadium. Fossils are rare in the shale and either are replaced by pyrite or are preserved as a film of g., Green, silty, glauconitic and fossiliferous shale occurs at the core of all Fort Payne buildups (Fig. 1). Krause and Meyer (2004) combined green shales within mounds with green-gray shales above the mounds into the same facies, but herein the shales are subdivided as a separate facies similar to (but slightly different from) the green shale …, ... fossiliferous shale. The Exshaw Formation in the study area consists of three members: an upper shale, middle siltstone unit, and a lower shale. The upper ..., Fossiliferous shale Bioturbated sandstone, sandstone-shale heterolith, laminated shale, fossiliferous mudstone and shelly beds Bioturbation is moderate to intense; Ophiomorpha, Chondrites, Thalassinoides and Planolites. Bioturbation is absent in laminated shale facies and shelly beds. Upper offshore Planar crossbedded sandstone, Limestone beds and fossiliferous shale beds are included in the lower part in the southeastern part of the State. The thickness ranges from about 9 to 25 feet. Kinney Limestone Member. This member generally includes two gray fossiliferous limestone beds separated by a gray fossiliferous shale bed. The thickness ranges from about 1 to 24 feet., Shale. Rock Type: Sedimentary – A detrital (clastic) sedimentary rock made up of silt/clay sized particles (individual particles are indistinguishable). Forms in layers …, The Eocene Ameki Formation of the Afikpo syncline in southeastern Nigeria is composed of sandstones and mudrocks. In its type area, five sedimentary facies are distinguished; these are in ascending order: (1) very fine to fine-grained calcareous quartz arenites; (2) fine to coarse, pebbly, bioturbated quartz arenites; (3) grey to dark, silty, fossiliferous shale; …, This photograph illustrates two fossiliferous shale beds in the lower Bartolo Member of the Atrasado Formation (white arrows). The shales contain a sparse, allochthonous flora of mixed seasonally ...