By Neal R. O’Brien, Roger M. Slatt (auth.)

ISBN-10: 1461234220

ISBN-13: 9781461234227

ISBN-10: 1461280052

ISBN-13: 9781461280057

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SEM micrographs illustrate vertical variations in micro fabric within the laminated shale. Preferred platy particle orientation dominates in clay-rich lamina I and 3 (Bl and B3). Between them is a 2 mm thick silt-dominated pyrite-bearing zone (see B2). In this zone clay is randomly oriented owing to the higher silt content (arrows at silt grains); however, this randomness may also be produced by rapid deposition of flocculated clay. Micrographs show the fabric and size variations between layers, which cannot be observed readily by xradiography.

BLACKSTONE LAYER (Kimmeridge Clay Formation, Jurassic) Kimmeridge Bay, Dorset, England. Compressed marine algae spore cases (yellow) are apparent. 1 mm. Plane light. 20 WHITE BAND - "PECTINATUS ZONE" (Kimmeridge Clay Formation, Jurassic) Kimmeridge Bay, Dorset, England. Compressed marine algae spore cases (yellow) are apparent. Quartz grains appear as clear areas. lmm. Plane Light. CLEVELAND SHALE MEMBER (Ohio Shale Formation, Devonian) Gallia County, Ohio. Compressed marine algae spore cases (yellow) are apparent.

Scale = 1 J1ffi. FECAL PELLETS A c B D 35 PALYNOMORPHS IN SHALES Microscopic resistant-walled organic bodies which include pollen and spores are called palynomorphs (Traverse, 1988) and may occur in shales. Other palynomorph bodies include acritarchs, dinoflagellate thecae and cysts, certain colonial algae, scolecodonts, chitinozoan, and other acid-insoluble microfossils (Traverse, 1988). Yellowish marine algal bodies are visible in examples shown here of some dark gray to black shales. One spore-like body, Tasmanites, is very commonly found in Devonian - Mississippian dark shales.

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Argillaceous Rock Atlas by Neal R. O’Brien, Roger M. Slatt (auth.)

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