Also known as Erketu ellisoni type, Bur Gove

Where: Dornogov, Mongolia (44.6° N, 109.4° E: paleocoordinates 46.7° N, 99.5° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Baynshire Formation, Cenomanian to Cenomanian (100.5 - 83.6 Ma)

• Beds lie below the Tsaagan Tsonch beds and above the Khara Khuutul beds, both believed to be of late Early Cretaceous age.

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•Update on age from Ksepka and Norell (2010): Deposits at Bor Guvé were originally interpreted as late Early Cretaceous in age because beds at this locality overlie the Khar Khutul beds (= Khara Khutul or Khar Hötöl). We previously considered the Khar Khutul beds to be Early Cretaceous in age (Ksepka and Norell, 2006) based on a ~128 Ma age reported for the lower part of the Tsagaantsav Svita by Shuvalov (2000). However, the application of the chronostratigraphic Svita concept to Cretaceous terrestrial deposits in Mongolia now appears to represent an oversimplification of the complexity characterizing these deposits (Eberth et al., 2009). Recent work in the area has suggested that the fossiliferous red beds at Shine Us Khudug in the local area belong to the Upper Cretaceous Javkhalant Formation (Eberth et al., 2009). Eberth et al. (2009) showed that these beds overlie the Baynshiree laterally to the east, south, and west. It appears that the Bor Guvé locality represents an extension of the known Baynshiree beds west of Shine Us Khudug. Furthermore, the beds are extraordinarily similar in lithology to classic Baynshiree strata in the adjacent area, and recent investigation during the summer of 2009 has demonstrated the presence of two types of freshwater mollusks typical of Baynshiree strata (Khaand, personal commun.). Provisionally we consider the sediments at the Bor Guvé locality to belong to the Baynshiree Formation. Although there has been much disagreement concerning the age and the composition of the Baynshiree Formation, Hicks et al. (1999) posit a Late Cretaceous (Cenomanian to Santonian) age for these and correlative strata on the basis of paleomagnetic and palynological evidence. Thus, fossils from Bor Guvé must now be considered early Late Cretaceous rather than late Early Cretaceous in age.

• group of beds-level stratigraphic resolution

Environment/lithology: "floodplain"; gray siltstone and sandstone

Size class: macrofossils

Collected by AMNH-MAS in 2002–2003

Primary reference: D. Ksepka. 2004. A sauropod from Bur Gove, Mongolia. Journal of Vertebrate Paleontology 24(3, suppl.):81A [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 59287: authorized by Matthew Carrano, entered by Kaitlin Maguire on 24.03.2006, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)