The basalt which makes up the Giant’s causeway is an igneous rock. Sedimentary rocks are formed by small rock pieces which are transported by rivers and laid down in layers. Chalk is a ...

Shale, also called mudstone, is a sedimentary rock formed from fine particles such as mud, silt, and clay. Shale is formed by finely bedded material that splits into thin layers. The pieces commonly ...

David says, 'It can take millions of years, but gradually fossils become exposed at the surface where we can find them. 'Because of how they form, fossils occur in sedimentary rocks. So if you're ...

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 ...

Whether sedimentary rocks store fossil hydrocarbons or act ... ranging from a few micrometers to sub-nanometers in size, are ...