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I'm interested in bidding for these sand dollars on our favorite website, but the seller can't tell me where they are from or what the statigraphy is. There are quite a few of them available on various websites, but they hardly give any more information about them. Most of them appear to be from Morocco, although I also saw similar ones from Florida. The given stratigraphy ranges from Cretaceous to Pleistocene and no one names even a genus, let alone a species. I sure would appreciate some details about them if anyone here in the forum has some in-depth information about them.
All right TFF family, my friend who owns a local rock shop is in need of IDs for some trilobites and a crinoid. I think these are probably from Morocco as most of the collection these came from are Moroccan and the trilobite prep looks typical of the area.
Ammonite Fossil Location: Unknown, possibly Morocco Ammonoids are an extinct group of marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms (known as heteromorphs). The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder (d. 79 AD near Pompeii) called fossils of these animals ammonis cornua ("horns of Ammon") because the Egyptian god Ammon (Amun) was typically depicted wearing ram's horns. Often the name of an ammonite genus ends in -ceras, which is Greek for "horn". Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Ammonitida