I am currently re-working the whole Hay Springs matter.
It will take several weeks to complete the job.
All articles dealing with Hay Springs will probably be modified.
Sorry...
Hibbard (1955) described as Equus Hesperohippus mexicanus a cranium from Tajo de Tequixquiac (No. 48 (HV-3) Museo Nacional de Historia Natural now catalogued as IGM 4009. He considered its age as Late Pleistocene.
Because of the size of its cranium E. mexicanus has currently been considered as (…)