476 



G. B. Richardson — Paleozoic Formations 



Table, of Paleozoic formations in the El Paso and Van Horn 

 Quadrangles, Texas. 



El Paso 

 quadrangle 



! Thick- 

 ness 



Sys- 

 tem 



m 



3 

 O 



3 

 «+* 



'a 



o 



5 



Series '' ™ C ^ Va " Ho ™ 

 : ness quadrangle 



Absent 





Permian '? 

 (Guadalupian) 



500 + 



Capitan 

 limestone 



Absent 





2000 + 



Delaware 

 Mountain 

 formation 



Hueco 

 limestone 



3000 



Pennsylvania!] 



2500 + 



Hueco 



limestone 



Absent 





Mississippian 





Absent 



Absent 





5 



'5 



o 



Q 







Absent 



Fusselman 

 limestone 



1000 



.2 



CO 



(Niagara) 





Absent 



Montova 



limestone 



250 



Cambrian Ordovician 



Upper and 



Middle 

 Ordovician 



250 



M on toy a 



limestone 



El Paso 

 limestone 



1000 



Lower 



Ordovician 



750 



El Paso 

 limestone 



Bliss 



sandstone 







to 

 300 



Saratogan or 

 Acadian 





 to 

 700 



Van Horn 

 sandstone 



is in contact with granite of post-Carboniferous age and 

 elsewhere it rests on rhyolite porphyry, of which it contains 

 rounded pebbles in the basal beds. In the central part of the 

 Franklin Mountains the sandstone thins out and locally disap- 

 pears, and the overlying limestone, containing a basal conglom- 

 erate, lies directly on the rhyolite porphyry. 



