000			03611nam a22003255i 4500
001			23042704
003			PUCPR
005			20240201112944.0
008			230331s2023 dcu 000 0 eng
010			_a 2023935694
040			_aDLC _beng _erda _cDLC
042			_apcc
049			_aPUCPR
092			_223
245	0	4	_aThe geology and vertebrate paleontology of Calvert cliffs, Maryland, USA : _bvolume 2, turtles and toothed whales / _cStephen J. Godfrey.
263			_a2308
264		1	_aWashington : _bSmithsonian Institution Scholarly Press, _c2023.
300			_apages cm
336			_atext _btxt _2rdacontent
337			_aunmediated _bn _2rdamedia
338			_avolume _bnc _2rdacarrier
490	0		_aSmithsonian contributions to paleobiology, _x00810266 ; _v107
520			_a"This volume is a follow-on to a publication by Smithsonian Press in 2018 on the Miocene vertebrate fauna from Calvert Cliffs, Maryland, USA. Two chapters are included in this compendium, one on the turtles (chelonians) and the other on the toothed whales (odontocetes). The chapter by Robert E. Weems details the occurrence of nineteen kinds of chelonians that have been discovered in the Miocene and Pliocene marine strata of Delaware, Maryland, and Virginia, USA, 13 of them in the Calvert Cliffs. The most commonly found remains are those of an extinct sea turtle, Trachyaspis lardyi. Remains of four other marine turtles, Procolpochelys grandaeva, Lepidochelys sp., a generically indeterminate cheloniid, and a leatherback turtle (Psephophorus polygonus), are far less common. The other 14 chelonian taxa are nonmarine forms that inhabited the land, rivers, and marshes west of the Mid-Atlantic Seaboard during the Miocene. They were occasionally washed into the coastal marine environments that were then accumulating the sediments exposed today as the strata in the Calvert Cliffs. Although rare, these nonmarine turtle finds provide significant insight into the onshore turtle fauna that lived in Delaware, Maryland, and Virginia at that time. In the second chapter, Stephen J. Godfrey and Olivier Lambert review the taxonomically diverse odontocete fauna of 29 named species. Nine of these Miocene taxa represent newly named species. Fragmentary remains hint at even greater diversity. Reviewed taxa are restricted to those known from along the Calvert Cliffs and other Miocene-age deposits on the Atlantic Coastal Plain in Maryland and Virginia, USA. They range in age from approximately 22 to 9 million years ago and derive from the Calvert, Choptank, and St. Marys formations. These fauna preserve one of the most abundant and diverse assemblages of extinct toothed whales known. None of the named odontocete species included in this review are known from beyond the North Atlantic Ocean. In terms of their chronostratigraphic distribution, collectively they range in age from the Aquitanian through the Tortonian with the large majority occurring within the Burdigalian, Langhian, and Serravallian stages (the latter two being the most speciose). The greatest taxonomic diversity occurred during the Mid-Miocene Climate Optimum, a time (ca. 17-15 Ma) when global average temperatures were as much as 4 to 5 degrees Celsius above today's average temperatures, at least for much of that interval"-- _cProvided by publisher.
650		0	_aPaleontology _9147060 _zMaryland, United States
650		0	_aVertebrates, Fossil _9185217 _zMaryland, United States
700	1		_aGodfrey, Stephen J., _eeditor.
906			_a0 _bibc _corignew _d2 _eepcn _f20 _gy-gencatlg
942			_c6 _2ddc
999			_c301496 _d301496