United States, Texas, Presidio, Ca. 2.0 airmiles NW of jct. US Rt. 90 and St. Rt. 17 in downtown Marfa. Southwestern part of Mimms Ranch (Dixon Water Foundation). Marfa Quadrangle.
30.32492 -104.04917
In rather sparse vegetation on fairly narrow ridge of dark brown trachyandesite porphyry (Petan Basalt), on otherwise very gently rolling landscape underlain by a mix of Perdiz Conglomerate (a fanglomerate of variable composition) and Quaternary alluvium. Vegetation dominated by Bouteloua gracilis, B. curtipendula, Tide-stroemia lanuginosa. Other associates included Amaranthus palmeri, Aristida adscencionis, Aristida ternipes, Artemisia sp., Bouteloua eriopoda, Croton pottsii, Dalea sp., Digitaria sp., Gaura coccinea, Lycurus setosus, Lygodesmia ramosissima, Nolina texana, Panicum hallii, Sida abutifolia, Talinum aurantiacum, Yucca elata, Zinnia grandiflora.