PBDB Collection

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Sirenia - Dugongidae

	Dugongidae indet. Gray 1821
Mammalia - Perissodactyla

	Desmostylia indet. Reinhart 1953
Mammalia - Perissodactyla - Paleoparadoxiidae

	aff. Paleoparadoxia sp. Reinhart 1959
Mammalia - Cetacea - Physeteridae

	Physeteridae indet. Gray 1821
Mammalia - Cetacea

	Liolithax ? kernensis Kellogg 1931
Mammalia - Cetacea - Kentriodontidae

	Kentriodontidae indet. Slijper 1936
Mammalia - Cetacea

	Mysticeti indet. Cope 1891

	aff. Parietobalaena sp. Kellogg 1924
Mammalia - Cetacea - Cetotheriidae

	Cetotheriidae indet. (Brandt 1872)
	sp. A, B, C

	aff. Nannocetus sp. Kellogg 1929	Avecilla-Guadarrama 1980	1 specimen
Mammalia - Carnivora

	Imagotariinae indet. Mitchell 1968
Mammalia - Carnivora - Odobenidae

	Nanodobenus arandai n. gen., n. sp. Velez and Salinas-Márquez 2018	Velez and Salinas-Márquez 2018	1 specimen

	aff. Neotherium sp. Kellogg 1931
Mammalia - Carnivora - Desmatophocidae

	aff. Allodesmus sp. Kellogg 1922
see common names

Geography

Time

Stratigraphy

Formation:	Torgugas
Stratigraphic resolution:	formation
Stratigraphy comments: near the base of the Tortugas Formation The geology around the type locality was mapped by Throughton [12] who referred to the sediments exposed here as the Tortugas Formation. The age of the Tortugas Fm. seems to be relatively broad across its distribution, ranging over mid–late Miocene [15]. The exposure at Arroyo La Chiva (Arroyo Tiburón) was dated by Pérez-Guzmán [16] to between 15.7 and 7.8Ma, based on the occurrence of radiolarians of the Dorcadospyris alata and Diartus hughesi zones [17]. Moreno-Ruiz & Carreño [14] studied the diatomites below the overlying Almejas Fm. in this area, and report diatoms belonging to the Denticulopsis hustedtii-D. lauta Subzone D, which gives it an age between 9.9 and 9.2 Ma [18]. The bone-bearing units are towards the lower part of the formation [12,13], therefore we restrict the range for UABC FCM 0072 and LACM 60914 to between 15.7 and 9.2Ma (Langhian–mid Tortonian: mid to late Miocene)

Lithology and environment

Primary lithology:	conglomerate
Includes fossils?	Y
Lithology description: pebble bed
Environment:	marine indet.

Taphonomy

Modes of preservation:	body
Size of fossils:	macrofossils

Collection methods and comments

Reason for describing collection:	general faunal/floral analysis
Taxonomic list comments:Arroyo Las Chivas Local Fauna

Metadata

Also known as:	Arroyo Tiburón, Arroyo Las Chivas; CAS 945, 960; IGM 126, 237, 2521, 2523, 2524, 2525, 2527, 2528, 2529, 2531; LACM 3892
Database number:	57778
Authorizer:	M. Uhen	Enterer:	M. Uhen
Modifier:	M. Uhen	Research group:	vertebrate
Created:	2005-12-22 12:55:25	Last modified:	2018-08-14 13:49:16
Access level:	the public	Released:	2005-12-22 12:55:25
Creative Commons license:	CC BY

Reference information

Primary reference:

L. G. Barnes. 1998. The sequence of fossil marine mammal assemblages in Mexico. Avances en investigacion 1 [M. Uhen/M. Uhen/M. Uhen]

Secondary references:

15591		C. Avecilla-Guadarrama. 1980. Localidades fosiliferas con Cetaceos en el Neogeno da Baja California, Mexico. Actas II Congresso Argentino de Paleontologia y Bioestratigrafia y I Congreso Latinoamericano de Paleontologia. Buenos Aires. II:335-339 [M. Uhen/M. Uhen/M. Uhen]
52088		L. G. Barnes. 2002. Evolutionary history of the fossil marine mammals of Mexico. In M. M. Ballesteros, J. A. Cabrales (eds.), Advances en los Estudios Paleomastozoologicos en Mexico 125-225 [M. Uhen/M. Uhen]
45300		J. Velez and F. M. Salinas-Márquez. 2018. A dwarf walrus from the Miocene of Baja California Sur, Mexico. Royal Society Open Science 5:180423 [M. Uhen/R. McClees-Funinan/M. Uhen]