192 E. Bose — Permian of Coahuila, N. Mex. 



and a second lower one a little above the plain of the 

 valley; the latter always lies about 50 meters above the 

 limit between the more strongly inclined Permian and 

 the less inclined Cretaceous. I first noticed this gypsum 

 bed immediately above the Hacienda de las Delicias 

 buildings and could follow it all through the range, but 

 it also exists east of the broad valley of Las Delicias and 

 in the lower portion of the Sierra del Venado. 



The conditions described above show clearly that the 

 Pichagua limestone and the Delicias beds are both of the 

 same age and represent a portion of the lower Permian 

 (Permo-Carboniferous). The occurrence of Waageno- 

 ceras dieneri Bose proves that these beds correspond to 

 a rather high horizon of the lower Permian, the zone of 

 Waagenoceras or the Word formation of the Glass 

 Mountains and the Delaware beds of the Guadalupian in 

 tbe Delaware Mountains of Texas. I have found the 

 same Stacheoceras sp. nov. or a very nearly related form 

 in a collection of fossils from the Delaware beds made 

 by Charles L. Baker in the hills south of Guadalupe 

 Point in northwestern Texas. There is, however, a pos- 

 sibility that the lower portion of the Delicias beds 

 corresponds to the Leonard formation of the Glass 

 Mountains, but this can not be established as yet, since 

 no Perrinites has been found in it; the frequency of 

 Fusulina elongata makes it appear rather probable that 

 this part also belongs to the zone of Waagenoceras. 



All the other fossils confirm our determination, espe- 

 cially the well preserved and very common Fusulina 

 elongata. I have found this form not only in the section 

 above Malascachas, but practically every^vhere in the 

 black limestones of the Delicias beds, from the Canon 

 Angosto to the slope of the Sierra del Sobaco above the 

 Pichagua cliff. 



The higher limestones of the Delicias beds, which in 

 general are less dark and much more siliceous than the 

 lower ones, often contain great quantities of crinoid 

 stems ; near the Puertecito (in the sunken block east of 

 the great fault) there are even actual crinoid limestones 

 which rarely show any other fossils. 



The Delicias beds do not contain any Devonian species, 

 as Haack supposed. If the determinations of this author 

 are correct, he must have had some Devonian forms in a 

 pebble out of the conglomerates, but as he says expressly 

 that his Gypidula aff. pseudogaleata occurs in the cal- 



