For 50 years, the region was known for just one type of fossil eggshell ... during that period. Shell fragments are useful indicators of biodiversity when the body fossil record is limited ...

Dr. Chris Shelton and student Kolby Dooling unearthed a rare, well-preserved ammonite fossil at a site in Oklahoma, and it ...

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 ...

Ammonite types with typical swirls ... a place world-famous for its abundance of ammonite fossils. “Those ammonites might have stored gases inside their shells and stood on the sea floor with ...