Geology of the Devonian black shales of the Appalachian Basin
... grained, well-rounded quartz grains are found at, or near, the base of some black shale units. To date, these well-rounded quartz grains have only been ...
... grained, well-rounded quartz grains are found at, or near, the base of some black shale units. To date, these well-rounded quartz grains have only been ...
clay, mudstone, shale and slate
... or red mudstones and shales may contain oxidized ferric iron minerals such as hematite (Fe2O3). Organic-rich shales are dark-grey or black, whereas pale-grey, pale-green or white mudstones may have a high content of one type of clay mineral (e.g. bentonite). Minute brassy crystals are usually pyrite ...
... or red mudstones and shales may contain oxidized ferric iron minerals such as hematite (Fe2O3). Organic-rich shales are dark-grey or black, whereas pale-grey, pale-green or white mudstones may have a high content of one type of clay mineral (e.g. bentonite). Minute brassy crystals are usually pyrite ...
Different Coloration of Devonian Shales
... of shales varies between greens, blues, greys, and blacks. This Devonian aged formation was an alternation of shale and sand stone, which shows evidence of a deep marine environment that was being altered over time. This study was done to discover the coloration of shales throughout the Devonian for ...
... of shales varies between greens, blues, greys, and blacks. This Devonian aged formation was an alternation of shale and sand stone, which shows evidence of a deep marine environment that was being altered over time. This study was done to discover the coloration of shales throughout the Devonian for ...
Fossils - Our eclass community
... likely to be buried by sediment and less likely to be destroyed by scavengers or erosion. Choose a low energy environment (a lake or swamp). Your remains are less likely to be destroyed by mechanical processes. ...
... likely to be buried by sediment and less likely to be destroyed by scavengers or erosion. Choose a low energy environment (a lake or swamp). Your remains are less likely to be destroyed by mechanical processes. ...
2002MidTermEPSC233Answers
... Precambrian stromatolites; archeocyathids (also accepted: an extinct type of sponge) or calcareous algae (in case of the escarpment next to the Burgess Shale) built Cambrian reefs; primitive corals, stromatoporoids and bryozoans built Ordovician reefs. I was looking for at least one type of organism ...
... Precambrian stromatolites; archeocyathids (also accepted: an extinct type of sponge) or calcareous algae (in case of the escarpment next to the Burgess Shale) built Cambrian reefs; primitive corals, stromatoporoids and bryozoans built Ordovician reefs. I was looking for at least one type of organism ...
Burgess Shale type preservation
The Burgess Shale of British Columbia is famous for its exceptional preservation of mid-Cambrian organisms. Around 40 other sites have been discovered of a similar age, with soft tissues preserved in a similar, though not identical, fashion. Additional sites with a similar form of preservation are known from the Ediacaran and Ordovician periods.These various shales are of great importance in the reconstruction of the ecosystems immediately after the Cambrian explosion. The taphonomic regime results in soft tissue being preserved, which means that organisms without hard parts that could be conventionally fossilised can be seen; also, we gain an insight into the organs of more familiar organisms such as the trilobites.The most famous localities preserving organisms in this fashion are the Canadian Burgess Shale, the Chinese Chengjiang fauna, and the more remote Sirius Passet in north Greenland. However, a number of other localities also exist.