Vera Eisenmann


Thursday 3 June 2010

From the chronology of the sites (probably outdated table), it appears that the Group A is very old: Thomson, Echo Quarry, Trinity River. Even the brachyodont Mesohippus, Miohippus (Meso-Mio), Hypohippus, Megahippus and Parahippus (Hypo-Mega-Para) have the same shortness of the naso-incisival notch.

The first Cormohipparion A seems to be Early Clarendonian (Big Spring 15871); it is present at MacAdams (73912) together with the first Group B representant (MacAdams 74400).

Cormohipparion B is the last to appear: Hans Johnson, Xmas Quarry.

titre documents joints

Approximate chronology

3 June 2010
info document : Excel
23 kb

Home | Contact | Site Map | | Site statistics | Visitors : 419 / 2420070

Follow site activity en  Follow site activity Equidae tridactyles (Hipparions sensu lato)  Follow site activity Northamerican archaic skulls, mandibles, and (...)  Follow site activity Remarks   ?

Site powered by SPIP 3.2.2 + AHUNTSIC

Creative Commons License