06 September 1983.
Hidalgo, Mexico
Locality: Hwy 85, Zimapan to Tamazunchale, at Las Trancas, about 6 km E along the track towards Nicolas Flores.
Coordinates: 21.0000, -99.1333
(Map it)
Elevation: 2420m.
Environment description: Mountainous area; faces SE in full sun; in loose rock along the road.