Changes

===Lithology===

===Lithology===

Lithology is one of the most useful criteria in selecting the types of fossils used in solving exploration problems. Organic-walled fossils, such as spores, pollen, and [[dinoflagellates]], are found in most [[argillaceous]] rocks, but they are rare in clean [[sandstone]] and [[limestone]]. Calcareous nannoplankton, foraminifers, conodonts, and ostracods can be recovered from [[shales]], sandstones, and many types of limestone. Siliceous radiolaria and diatoms occur in shale and deep water limestone.

Lithology is one of the most useful criteria in selecting the types of fossils used in solving exploration problems. [[Palynomorphs (organic-walled microfossils)|Organic-walled fossils]], such as spores, pollen, and dinoflagellates, are found in most [http://www.merriam-webster.com/dictionary/argillaceous argillaceous] rocks, but they are rare in clean [[sandstone]] and [[limestone]]. Calcareous nannoplankton, foraminifers, conodonts, and ostracods can be recovered from [[shales]], sandstones, and many types of limestone. Siliceous radiolaria and diatoms occur in shale and deep water limestone.

===Diagenesis===

===Diagenesis===