|
Streblitinae
Streblitinae is a subfamily of Upper Jurassic and Lower Cretaceous ammonites within the family Oppeliidae Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal famil ... characterized by compressed, involute shells; typically oxycones with complex sutures. Includes '' Streblites'', '' Pseudoppelia'', and '' Substreblites''. Derivation is from the Taramelliceratinae. May have given rise to the Aconiceratinade. References W.J. Arkell ''et al.'', 1957 Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology, Part L. Geological Society of America and University of Kansas Press. D.T. Donovan, J.H. Callomon, and M.K. Howarth, 1981. Classification of the Jurassic Ammonitina. The Systematics Association Special Volume no. 18. The Ammonoidea. Academic Press. Oppeliidae Late Jurassic first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Uhligites
''Uhligites'' is an oppeliid ammonite included in the subfamily Streblitinae that lived during the latest part of the Jurassic and earliest Cretaceous; from about 150 to 140 m.y.a. ''Uhligites'' has been found in uppermost Jurassic (Tithonian) sediments in China, India, New Zealand, and Yemen, and the Lower Cretaceous (Berriasian In the geological timescale, the Berriasian is an age/stage of the Early/Lower Cretaceous. It is the oldest subdivision in the entire Cretaceous. It has been taken to span the time between 145.0 ± 4.0 Ma and 139.8 ± 3.0 Ma (million years ago) ...) sediments, also in Yemen, and in Antarctica. Related genera include '' Streblites'', '' Substreblites, and '' Cyrtosiceras''. References ''Uhligites''-Paleodb* Arkell ''et al.'', 1957. Mesozoic Ammonoidea; Treatise on Invertebrate Paleontology, Part L, Geological Society of America. * D.T, Donovan, Collomon, J.H, and Howarth, M.K 1981. Classification of the Jurassic Ammonitina. The Ammmonoidea; Syste ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oppeliidae
Oppeliidae are compressed to oxyconic, sculptured Haploceratoidea, either unkeeled, unicarinate, bicarinate, or tricarinate; with sutures in great variety, but ribbing usually more or less falcoid or falcate. The Oppeliidae is the principal family of the Haploceratoidea, with the longest duration, extending from the Middle Jurassic (Bajocian) to the Upper Cretaceous (Cenomanian) Their derivation is from the Hildoceratoidea. Subfamilies Nine subfamilies are recognized, the first eight of which are included in the earlier Treatise, Part L. They are the: :Oppeliinae :Hecticoceratinae :Distchoceratinae :Teramelliceratinae :Phlycticeratinae :Streblitinae :Mazapilitinae :Aconeceratinae :Binneyitinae The Binneyitinae was added by Donovan ''et al'', 1981, transferred from the Stephanoceratoidea. References * D.T Donavan, J.H. Callomon, and M.K Howarth. 1981. Classification of the Jurassic Ammonitina. In The Ammonoidea. M.R. House and J.R. Senior, eds. Systematics Assoc. Pub Acad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The Jurassic constitutes the middle period of the Mesozoic, Mesozoic Era and is named after the Jura Mountains, where limestone strata from the period were first identified. The start of the Jurassic was marked by the major Triassic–Jurassic extinction event, associated with the eruption of the Central Atlantic magmatic province, Central Atlantic Magmatic Province. The beginning of the Toarcian Stage started around 183 million years ago and is marked by an extinction event associated with widespread Anoxic event, oceanic anoxia, ocean acidification, and elevated temperatures likely caused by the eruption of the Karoo-Ferrar, Karoo-Ferrar large igneous provinces. The end of the Jurassic, however, has no clear boundary with the Cretaceous and i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin ''creta'', "chalk", which is abundant in the latter half of the period. It is usually abbreviated K, for its German translation ''Kreide''. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels that created numerous shallow inland seas. These oceans and seas were populated with now- extinct marine reptiles, ammonites, and rudists, while dinosaurs continued to dominate on land. The world was ice free, and forests extended to the poles. During this time, new groups of mammals and birds appeared. During the Early Cretaceous, flowering plants appeared and began to rapidly diversify, becoming the dominant group of plants across the Earth b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
