There are three main types of rock: igneous rock, metamorphic rock, and sedimentary rock. Almost all fossils are preserved in sedimentary rock. Organisms that live in topographically low places (such ...

"Our study focuses on chemical sedimentary rocks found in the ... that the carbon isotopic composition of these rocks is indicative of a biological origin, but rather suggesting abiotic ...

During biological weathering ... Rock particles can be transported by rivers and form sedimentary rocks. 1 Sediment transport Sediment transport is the first all of the processes by which the ...

Claims about the biological origin of structures that ... a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz. 5. Western Australia’s Pilbara Craton ...

I am a chemical sedimentologist: I study how and why chemical sediments form and lithify, with the goal of better understanding how chemical sedimentary rocks (e.g., carbonates, chert, iron formations ...