(n.) An extinct genus of marine reptiles; -- so named from their short, biconcave vertebrae, resembling those of fishes. Several species, varying in length from ten to thirty feet, are known from the Liassic, Oolitic, and Cretaceous formations.
Example Sentences:
Triassic
Definition:
(a.) Of the age of, or pertaining to, the Trias.
(n.) The Triassic formation.
Example Sentences:
(1) The evolution of enamel structure is dealt with here on the basis of fossil reptiles and mammals ranging from the Triassic to the present.
(2) It is hypothesized that this group arose in the early Triassic period, prior to the breakup of Pangea.
(3) Triassic-Jurassic, c 200 million years ago Three-quarters of species were lost, again most likely due to another huge outburst of volcanism.
(4) All the enamels investigated from the Triassic contained columns of crystals, which were deduced as hexagonal.
(5) The fissure faunas are generally thought to be of Upper Triassic (Rhaetic) age (Kühne 1946), although Kermack, Musset & Rigney (1973) believe that the evidence is insufficient to determine whether the deposits are Rhaetic or Lower Liassic.
(6) Therapsids, first appearing in the Early Permian, were thought to become extinct in the Middle Jurassic, soon after the Late Triassic origin of mammals.
(7) Permian-Triassic, c 250 million years ago The big one – more than 95% of species perished, including trilobites and giant insects – strongly linked to massive volcanic eruptions in Siberia that caused a savage episode of global warming.
(8) – Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous … 'What will survive of us is love', wrote Philip Larkin.
(9) It is concluded that the existence of an interprismatic region provides the most important distinction between prismatic enamels and the hexagonal columns of crystals in the Triassic material.
(10) Probelesodon, as surely other species, have acquired in Middle Triassic times a relative brain size rather closed to that of certain fossil and living mammals.
(11) Major mass extinctions among tetrapods took place in the early Permian, late Permian, early Triassic, late Triassic, late Cretaceous, early Oligocene and late Miocene.
(12) 3 Permian-Triassic mass extinction, c 250 million years ago.
(13) The Manicouagan impact structure of Quebec provides dates broadly compatible with the Triassic-Jurassic boundary and, following the impact theory of mass extinctions, may be implicated in the cause.
(14) Neusticosaurus pusillus is biostratigraphically important because it is one of the rare species reported from both the Germanic and the Alpine Triassic.
(15) The fragment was embedded in a pebbly quartzose sandstone, probably of fluvial origin, in the lower part of the Triassic Fremouw Formation (as yet undefined), which contains Dicroidium in the upper part.
(16) The purposes of this monograph are to describe the postcranial skeletons of the earliest known mammals, and to probe, in so far as possible by osteological study, biological questions concerning the habits and adaptations of these late Triassic forms.
(17) As was previously suggested by studies of marine invertebrates, this pattern is consistent with a global extinction event at the Triassic-Jurassic boundary.
(18) Uricoteley was in part responsible for the radiation of the archosaurs during the Triassic as a water-conserving mechanism in the adult, thereby allowing them to invade the arid environments of that period.
(19) A newly discovered Argentinian Middle Triassic form shows, for the first time in an ancestral reptile, definite evidence of a squamosal-dentary articulation supplementary to the persistent primitive connection.
(20) During the Late Triassic period, fallen trees were buried by sediment with a high content of volcanic ash.