146 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Sek. 



Jeffreys, speaking of the Ozuluama and Temapache regions, 

 says: 



"These Tertiaries chiefly consist of coarse h'mestones, fossil- 

 iferous as at Ozuluama and Topila; there are also strata of 

 bluish limestones weathering to yellow, and some soft coarse 

 blue sandy silt deposits underlying the former ; nummulites are 

 present in most of the limestones, but more abundant in certain 

 sections, especially near by Ozuluama. The so-called Tema- 

 pache limestones are decidedly of a higher horizon than that 

 of the Ozuluama Series, but are very similar in lithological 

 character. They are somewhat thicker, however, and probably 

 ostrea are more abundant in the southern series. There are 

 also a few more or less localized conglomerates in the Tan- 

 cochin area. 



"The whole series throughout are interbedded with a softer 

 calcareous yellow sandy material, full of small white calcareous 

 forms. 



"Under what conditions these Tertiaries were deposited is 

 difficult to estimate, but they were probably laid down in not a 

 very deep sea. 



"The Tertiary beds on the eastern side, moreover, are not 

 homogeneous throughout. That is to say, we have beds in the 

 southeastern and central portion which are not represented 

 with a similar bed at the same horizon in the northeastern sec- 

 tion." 



In the vicinity of Tuxpam we find shales, marls, and sand- 

 stones overlying fossiliferous yellow limestones. Similar beds 

 are found southward along the Cazones River and eastward 

 almost to the Gulf shore at Nautla. 



De Golyer^^ says of the beds in this region : 



"Overlying the Mendez shales is a thick series of sandstones, 

 shales, impure fossiliferous limestones and occasional conglom- 

 erates of Oligocene age. The various strata making up this 

 formation are lenticular and grade laterally into each other. 

 Near the front of the Sierra Madre occur beds of shale so thick 

 that their outcrops are hardly distinguishable from those of the 

 Mendez shales." 



" De Golyer, A. I., M. E., p. 1906. 



