![]() Small and extremely rare squamate reptiles of the marine Dolichosaurus longicollis possibly took shelter or fed within these unique benthic submarine depression “islands”. The empty shells encrusted by different epizoans sheltered and protected also crustaceans, which undermined the empty shells by bioturbation. The ammonite shells were benthic islands and minibiotopes in carbonate soft- to firm ground environments along a submarine swell in the southern North Sea Basin of Central Europe. They lived in the ocean from about 240 to 65 million years ago, when they went extinct along with the non-avian dinosaurs. They sported a ribbed, spiral shell, and were able to move by a sort of jet propulsion by expelling water through an opening in their shell. ![]() Between these hundreds of other macrofaunal remains accumulated. Ammonites are close relatives of the living chambered nautilus. They built up to five square meter extended scour troughs in which the shells are enriched in chain-, fan- and fan layer orders with a maximum accumulation of 24 cephalopods. These absolutely incredible Long Ammonite Statement Earrings contains natural Ammonite fossils with colourful Ammolite inclusions on the back of the stones. On the sea floor, deposited ammonite shells scoured up to 50 cm depth which caught more and more large shells over extended periods of time. Their shells indicate adaptations in the body chamber morphology depending on the environment. no date: Strata: Fort Worth Period: Cretaceous (100 mya) Fort Worth, TX. Formation: Duck Creek Period: Cretaceous (100-101 mya) Tarrant Co., TX. In the greenhouse world of the Early Upper Cretaceous of Europe giant cephalopod shells of the hemibenthic ammonite Puzosia formed huge accumulations. A cache of ammonites found close together.
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