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Gundolficeras
''Gundolficeras'' is member of the Tornoceratidae, (goniatitid ammonites), from the Late Devonian named by Becker, 1995 and assigned to the Falcitornoceratinae. The type species is ''"Lobotornoceras" bicaniculatum''. ''Gundolficeras'' has a compressed or somewhat inflated shell that may have ventrolateral furrows and an open or closed umbilicus at medium stages. The suture has a small ventral lobe and on either side, a narrow, asymmetric, rounded or pointed adventitious lobe and a high saddle located mid-flank. ''Gundolficeras'' differs from its partly contemporary, but slightly older relative ''Falcitornoceras ''Falcitornoceras'' is a goniatitid ammonite from the Late Devonian, early Famennian The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 3 ...'' in the details of the suture and in sometimes having an open umbilicus. References *''Gundolficeras'' iGONIAT Online ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tornoceratidae
Tornoceratidae is a family of goniatitid ammonoids from the middle and upper Devonian. The family is included in the suborder Tornoceratina and the superfamily Tornoceratoidea. Tornoceratids are subdiscoidal goniatitids with biconvex growth lines and sutures that form 6 to 10 lobes, the ventral one undivided, the lateral ones originating as subdivisions of external and internal lateral saddle. They are derived from the Anarcestida. Taxonomy Tornoceratidae as now understood is essentially the Tornoceratidae of Arthaber (1911) described in the American Treatise on Invertebrate Paleontology, Part L, revised to include three subfamilies, the Tornoceratinae, Aulatornoceratinae, and Falcitornoceratinae. Miller ''et al''. (1957) included the Tornoceratidae without subfamilies in the Cheilocerataceae, a superfaminily in the Goniatitida which also includes the Cheiloceratidae. Tornoceratinae is based on the genus ''Tornoceras'' described by Alpheus Hyatt in 1884. Aulatornocera ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Falcitornoceratinae
Falcitornoceratinae is one of three subfamilies of the Tornoceratidae family, a member of the Goniatitida Goniatids, informally goniatites, are Ammonoidea, ammonoid cephalopods that form the order Goniatitida, derived from the more primitive Agoniatitida during the Middle Devonian some 390 million years ago (around Eifelian stage). Goniatites (goniat ... order. Shells produced are extremely involute and have no umbilicus. Young and intermediate whorls have ventrolateral grooves. The adventitious lobe, which develops ontogenetically between the external, or ventral, and lateral lobes, is widely rounded. Tornoceratids in which the Falcitornoceratinae are included are involute, subdiscoidal, with sutures that form 6 to 10 lobes. References *Falcitornoceratinae inGONIAT6/9/12 Falcitornoceratinaein Paleobiology Database, 6/9/12 Tornoceratidae Late Devonian first appearances Late Devonian animals Famennian extinctions {{Goniatitida-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Falcitornoceras
''Falcitornoceras'' is a goniatitid ammonite from the Late Devonian, early Famennian The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 371.1 million years ago to 359.3 million years ago. An earlier 2012 estimate, still used b ..., that has been found in France and Spain. ''Falcitornoceras'' was named by House and Price, 1985, and is the type genus for the subfamily Falcitornoceratinae. The shell of ''Falcitornoceras'' is strongly involute, lacking an umbilicus. Juvenile stages have falcate ribs which cross the ventral rim; the ventro-lateral area bears weak to strong furrows. The adventitious lobe, high on the flank, is rounded or subacute and the lateral lobe has an inconspicuous saddle at the umbilical seam. ''Falcitornoceras'' is slightly older than '' Gundolficeras'' and somewhat younger than '' Phoenixites'', close relatives, although temporally overlapping both. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Famennian
The Famennian is the latter of two faunal stages in the Late Devonian Epoch. The most recent estimate for its duration estimates that it lasted from around 371.1 million years ago to 359.3 million years ago. An earlier 2012 estimate, still used by the International Commission on Stratigraphy, estimated that it lasted from million years ago to million years ago. It was preceded by the Frasnian stage and followed by the Tournaisian stage. Major events In the seas, a novel major group of ammonoid cephalopods called clymeniids appeared, underwent tremendous diversification and spread worldwide, then just as suddenly went extinct. The beginning of the Famennian is marked by the final stages of a major extinction event, the Kellwasser Event, which is the largest component of the Late Devonian Mass extinction. The end of the Famennian experiences a smaller but still quite severe extinction event, the Hangenberg Event. A brief episode of glaciation, possibly linked to the Hangenber ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Late Devonian Ammonites
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Fossils Of Morocco
A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in amber, hair, petrified wood and DNA remnants. The totality of fossils is known as the ''fossil record''. Paleontology is the study of fossils: their age, method of formation, and evolutionary significance. Specimens are usually considered to be fossils if they are over 10,000 years old. The oldest fossils are around 3.48 billion years old to 4.1 billion years old. Early edition, published online before print. The observation in the 19th century that certain fossils were associated with certain rock strata led to the recognition of a geological timescale and the relative ages of different fossils. The development of radiometric dating techniques in the early 20th century allowed scientists to quantitatively measure the absolute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ammonites Of Africa
Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, 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 appeared during the Devonian, with the last species vanishing during the Cretaceous–Paleogene extinction event. Ammonites are excellent index fossils, and linking the rock layer in which a particular species or genus is found to specific geologic time periods is often possible. Their fossil shells usually take the form of planispirals, although some helically spiraled and nonspiraled forms (known as heteromorphs) have been found. 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 ( 79 AD nea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
