Photos of the fossil — yes, it’s assumed to be a fossil — were shared Feb. 8 on social media by the National Park Service, which isn’t sure of its origin. It has “an odd round shape ...

The recent shells retain the organic material that give the shells ... the original is a function of the chemistry of the groundwater. The ammonoid (the round, snail-ish fossil) has been replaced by ...

Based on the fossil record, ammonites came in a wide range of sizes and shapes, from smaller than an inch to as large as nine feet wide. Some ammonites had long, straight shells, while others had ...

Land animals and plants usually decomposed or were eaten, and mainly the hard parts -- teeth, bones, shells, or wood -- were preserved. Fossils can be formed in several ways. Buried bone and shell ...

The fossil that was originally interpreted to be a plant, but researchers have now discovered is the inside of the shell of a baby turtle. Disclaimer: AAAS and EurekAlert! are not responsible for ...

We have examined fossil bivalve shells to try to determine whether the obvious growth lines on the shells are related to tidal or other environmental phenomena. Although the study is continuing ...