Crinoids fossil

详情

The term Crinoids refers to an extant (living) class of Echinoderms. These animals, commonly known as "sea lilies" and "feather stars", have a long history. They first appear in the fossil record in marine sediments deposited around **0 million years ago during the Cambrian period. Stemmed forms referred to as sea lilies because of their superficial resemblance to flowers. These stemmed crinoids became abundant in the middle Ordovician period, **0 million years ago, and flourished in the shallow inland seas of the Palaeozoic Era. Though so abundant that many late Palaeozoic limestone deposits are composed primarily of Crinoids skeletal parts, they nearly became extinct **0 million years ago at the end of the Palaeozoic Era. Fossil Crinoids first appear in the fossil record in marine sediments deposited around **0 million years ago during the Cambrian period; Used to be gathered by the ancients and used for medicine, religion and adornment. Scientists described fossil crinoids� decades before living forms were recognized. some great museums display these delicate and exquisite fossils.