Agama atra atra
I'm not sure of this identification.
in a dry fields. disturbed In recent years. 99% dandelion. still had growth from last year. many dead grasses and fresh buffalo berries.
I believe this is a young changeable lizard.
Sorry for the bad pic. Its a screen grab. I knew I wouldn't be able to get close enough with my iPhone to get a proper pic so I used video and pushed in as close as i could before it ran off. The original video is posed here and gives a better impression of the lizard.
Frilled Necked Lizard