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Cylindracanthus Rectus
''Cylindracanthus'' is an extinct, enigmatic genus of marine Actinopterygii, ray-finned fish with fossils known throughout North America, Europe, Asia and Africa from the Late Cretaceous to the late Eocene'''', with potential Oligocene records and a possible Miocene record also known.'''' It is exclusively known from its distinctive partial remains, which are long cylindrical bony spines that are usually considered Rostrum (anatomy), rostrum fragments, as well as some associated teeth. These spines are abundant & widespread throughout this timespan, and are useful indicators of a nearshore marine environment, but the taxonomic identity of the fish is still highly uncertain and debated.''BARBARA S. GRANDSTAFF, RODRIGO A. PELLEGRINI ,, KENNETH A. MONSCH, DAVID C. PARRIS and DONALD CLEMENTOVER A CENTURY OF THIN-SECTION MICROSCOPY OF THE FOSSIL FISH CYLINDRACANTHUSNEW JERSEY STATE MUSEUM INVESTIGATIONS NO. 6, 2018'' Taxonomy Most of the earlier-described species in this genus were ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cenomanian
The Cenomanian is, in the International Commission on Stratigraphy's (ICS) geological timescale, the oldest or earliest age (geology), age of the Late Cretaceous epoch (geology), Epoch or the lowest stage (stratigraphy), stage of the Upper Cretaceous series (stratigraphy), Series. An age is a unit of geochronology; it is a unit of time; the stage is a unit in the stratigraphic column deposited during the corresponding age. Both age and stage bear the same name. As a unit of geologic time measure, the Cenomanian Age spans the time between 100.5 and 93.9 million years ago (Mya). In the geologic timescale, it is preceded by the Albian and is followed by the Turonian. The Upper Cenomanian starts around at 95 Mya. The Cenomanian is coeval with the Woodbinian of the regional timescale of the Gulf of Mexico and the early part of the Eaglefordian of the regional timescale of the East Coast of the United States. At the end of the Cenomanian, an anoxic event took place, called the Cenomani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
