Description of the Geology of the Tecolotlan Graben, Jalisco, Mexico

Kowallis, Bart J.

doi:10.1130/2017.dmch022.txt

Cited by 5 publications

(18 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the stratigraphic sequence has been identified in two areas of main importance: Santa María sequence at the base and San José deposits that cover them. Resting in erosional unconformity are found the San Buenaventura deposits, thought to be of Blancan age (Carranza-Castañeda, 2016; Kowallis et al, 2017;McDonald and Carranza-Castañeda, 2017).…”

Section: The Tecolotlán Basinmentioning

confidence: 99%

“…The age of the fauna has been determined by radiometric dating of the ashes that are interbedded with the fossiliferous strata. The ash found in the upper part of the San José area, was dated by the method of 40 Ar/ 39 Ar, and gave an age of 4.95 ± 0.02 My and (Kowallis et al, 2017). In recent works, a new date was made by the Laboratorio de Estudios Isotopicos, Centro de Geociencias, UNAM (LA-ICPMS), from a different site, by the method of U/Pb using zircons, which produced a date of 4.85 ± 0.1 My for the ash (McDonald and Carranza-Castañeda, 2017).…”

Section: The Tecolotlán Basinmentioning

confidence: 99%

“…The contact with the deposits of San Jose is not exposed. The age of the sequence of San Buenaventura has been referred to the Blancan (Kowallis et al, 2017).…”

Section: The Tecolotlán Basinmentioning

confidence: 99%

See 2 more Smart Citations

Dinohippus mexicanus (Early-Late, Late, and Latest Hemphillian) and the Transition to Genus Equus, in Central Mexico Faunas

Carranza-Castañeda

2019

Front. Earth Sci.

View full text Add to dashboard Cite

In the advances of the research of the sedimentary basins from central Mexico, it is significant the discovery of the first records of equids of Clarendonian and early Hemphillian age that are mentioned. The specimens were collected in southwest deposits of the San Miguel de Allende basin, the ages are verified by radiometric dates. The largest collection of Dinohippus mexicanus skulls jaws and isolated teeth recovered, have shown the wide geographical distribution in faunas of central Mexico. The study of these records from localities of Coecillos, Rinconada, Arroyo Emilio, and Rancho el Ocote faunas of the San Miguel Allende, Guanajuato state, Tecolotlán, Jalisco state and Juchipila basin Zacatecas state, have shown the variability and transitional features they have in the structures of the skull and upper and lower molars. The skull from Tecolotlán and Rancho El Ocote, of the late Hemphillian age present a well-defined dorsal fossa, in contrast the oldest skull from early-late Hemphillian of Juchipila, the fossa is just a depression in the Maxillary and nasal bone, however, the skull from Coecillos has structures that differentiate it from others. The most relevant records are the lower and upper molars collected at the top of the biostratigraphic sequence of Rancho El Ocote, in the sites named GTO 2 site D and F. These specimens present features that differentiate them from Dinohippus and suggest a primitive Equus. Upper teeth from the Blancan age of Tecolotlán basin, have a high crown but a pronounced curvature like the Dinohippus mexicanus collected in the late Hemphillian strata of this basin.

show abstract

Section: The Tecolotlán Basinmentioning

confidence: 99%

Section: The Tecolotlán Basinmentioning

confidence: 99%

See 1 more Smart Citation

Dinohippus mexicanus (Early-Late, Late, and Latest Hemphillian) and the Transition to Genus Equus, in Central Mexico Faunas

Carranza-Castañeda

2019

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

“…Some years later, MacFadden and Carranza-Castañeda (2002) commented on the horse record from Anza-Borrego desert in California, where Downs and Miller (1994) described a cf. Dinohippus specimen of late Blancan age (≈2.7 Ma) associated with specimens of Equus simplicidens; they also reported some isolated teeth with a transitional morphology of equine horses pertaining to Dinohippus and/or Equus from the San Buenaventura Formation (late Blancan, 2.62 Ma) in the Tecolotlán area of Jalisco state, west-central Mexico (Kowallis et al, 2017); some of these teeth can be identified as D. mexicanus, while others can be referred to primitive Equus (E. cf. simplicidens).…”

Section: Comment On the Origin Of Equusmentioning

confidence: 97%

Evolutionary Significance of Equinae From the Mexican Neogene

Bravo-Cuevas

Jiménez-Hidalgo

2019

Front. Ecol. Evol.

View full text Add to dashboard Cite

North American Equinae integrates a monophyletic clade that consists of about 20 genera and 80 species. This group includes horses with hypsodont cheek teeth belonging to the merychippines and the tribes Hipparionini, Protohippini, and Equini. The primary adaptive radiation and diversification of Equinae occurred in the Neogene period (23.03-2.53 Ma). In Mexico, 11 genera and 20 species of Neogene Equinae have been reported, which correspond to 55 and 28% of the generic and specific diversity in North America, respectively. The Mexican record exhibited their major diversity during the late Miocene (10 species) and evidences part of the evolutionary history of North American Equinae, as it is stated in the following considerations: (1) The presence of merychippine species from the late Hemingfordian-early Barstovian (18-15 Ma) of southern Mexico ("Merychippus" cf. primus and "M." cf. sejunctus) that are related with earliest representatives of Equinae in North America. (2) The occurrence of populations referable to Cormohipparion aff. quinni, Calippus sp., and Pliohippus sp. from the early-late Barstovian (15-14 Ma) of southern Mexico, which are synchronous with the first known appearances of those genera from the Great Plains and Gulf Coastal Plain in the United States. (3) The equine horse Dinohippus mexicanus from the late Hemphillian (4.8 Ma) of central and northern Mexico that is considered the closest sister species of primitive Equus. These records suggest that early differentiation of some hipparionines, protohippines, and equines may have had occurred also in areas of southern tropical North America during the middle Miocene; furthermore, the origin of primitive Equus could be traced from the Mexican record.

show abstract

“…The Tecolotlán basin in Jalisco state is located 110 km to the southwest of Guadalajara city, in the northeastern part of the Jalisco block, in west-central Mexico (Figure 1). The basin has an extension of 20 km and is 10 km in width, and it is part of numerous small basins parallel to the large basin of Tepic-Zacoalco (Kowallis et al, 2010(Kowallis et al, , 2017.…”

Section: Geological Settingmentioning

confidence: 99%

A new species of Sigmodontinae (Rodentia) from the late Hemphillian of central Mexico, and comments on the possible radiation of this group

Pacheco-Castro¹,

Carranza-Castañeda²,

Jiménez-Hidalgo³

2019

revmexcg

View full text Add to dashboard Cite

The Sigmodontinae subfamily represents one of the most diverse groups of mammals in the world; this rodent group evolved in the open and arid ecosystems of the Miocene of North America and was the most successful legion of mammals in the Great American Biotic Interchange. Part of its diversification occurred in the Mexican Pliocene, in the Hemphillian-Blancan boundary, where Prosigmodon and Sigmodon species are very common. Recent molecular phylogenetic systematics research propose that Sigmodon is related to South American sigmodontines, while studies of classical morphometry in isolated molar teeth consider Prosigmodon as synonymy of Sigmodon, which modifies the biogeographic and chronostratigraphic interpretations of this group in America. In this paper, we describe a new species of Prosigmodon from the late Hemphillian (~4.89 Ma) of central Mexico based on jaws, maxillary, and complete isolated teeth. This is the most complete and austral record of the genus in North America. This species was compared with North American species of the Sigmodontinae and Neotominae subfamilies and we defined it as a new Prosigmodon species characterized by having a consistently present minute mesoloph in M1 and M2, in addition, there is an isolated metaconid from the protoconid in the m1 of young individuals. We performed a phylogenetic model focused on understanding the relationship between Prosigmodon (four species) and Sigmodon (eight species), where we included Baiomys (two species), Neotoma (two species), Peromyscus (two species), and Reithrodontomys (two species). Our results indicate that Prosigmodon is a monophyletic group if Sigmodon minor is included within the genus and P. chihuahuensis is excluded. The Mexican Prosigmodon species have more apomorphic characters with respect to S. minor and P. holocuspis. The species of Prosigmodon and Sigmodon are not closely related, Sigmodon is more related to the Neotoma species than the species of Baiomys, Prosigmodon, Reitrhodontomys, and Peromyscus. Based on the topology of our cladogram and the stratigraphic ranges of the species Sigmodontinae and Neotominae, we discuss that Baiomys, Prosigmodon, Reitrhodontomys, and Peromyscus probably diversified in the early Hemphillian, while Sigmodon and Neotoma did so during the late Pliocene.

show abstract

Description of the Geology of the Tecolotlan Graben, Jalisco, Mexico

Cited by 5 publications

References 88 publications

Dinohippus mexicanus (Early-Late, Late, and Latest Hemphillian) and the Transition to Genus Equus, in Central Mexico Faunas

Dinohippus mexicanus (Early-Late, Late, and Latest Hemphillian) and the Transition to Genus Equus, in Central Mexico Faunas

Evolutionary Significance of Equinae From the Mexican Neogene

A new species of Sigmodontinae (Rodentia) from the late Hemphillian of central Mexico, and comments on the possible radiation of this group

Contact Info

Product

Resources

About