El Antimonio Group

Geology

Formations: Rio Asunción (3), Sierra de Santa Rosa (32)

Lithologies: "siliciclastic" (2), mudstone (18), "shale" (9), siltstone (5), sandstone (1), marl (1), wackestone (1), grainstone (3), rudstone (2), "limestone" (15)

Paleoenvironments: sand shoal (3), deep-water indet. (32)

Age range: base of the Late/Upper Triassic to the top of the Early/Lower Pliensbachian or 237.00000 to 183.00000 Ma
Collections

Time interval Ma Country or state Original ID and collection number
Late/Upper Triassic237.0 - 201.4Mexico (Sonora) (234365 234382 234383)
Late/Upper Hettangian201.3 - 196.5Mexico (Sonora) (208236 208237)
Early/Lower Sinemurian196.5 - 189.6Mexico (Sonora) (208238 208239 208240 208242 208243)
Late/Upper Sinemurian196.5 - 189.6Mexico (Sonora) (208257 208244 208247 208248 208276)
Early/Lower Pliensbachian189.6 - 183.0Mexico (Sonora) (208260 208262 208264 208265 208266 208267 208268 208269 208270 208271 208272 208273 208274 208275 208277 208278 208279 208280 208281 208282)