Chapter XVII. 

 LATER TERTIARY (MIOCENE AND PLIOCENE). 



Colors, yellow, light yellow, lemon-yellow. 



Symlols, 4, 3, 2. 



Distribution: Later Tertiary, where the Miocene and Pliocene are recognized but can not be 

 ' separated or individually identified in the present state of knowledge. The Miocene is 

 separately indicated on the Pacific coast and on the Atlantic and Gulf coasts, so far as 

 surveys permit. Elsewhere on the map it is comprised with Phocene under the term 

 "Later Tertiary" (4). The Phocene is distinguished on the Atlantic and Gulf coasts, so 

 far as surveys permit, in CaUfornia, and in northern Nevada. Elsewhere on the map it 

 is classed with the Quaternary (1), as in the valley deposits of the Great Basin; or with 

 the Miocene under the heading "Later Tertiary" (4). The Lafayette formation of the 

 Atlantic and Gulf slopes, including the Altamaha of Georgia, is shown only where it com- 

 pletely conceals the underlying formations. 



Content: Pacific coast marine deposits; Alaskan Arctic Coastal Plaia deposits; fluviatile and 

 lacustrine beds of the Interior; western Gulf coast marine formations; and late marine 

 Tertiary of Mexico, Central America, and South America. Monterey shale and equiva- 

 lents of the Pacific coast; beds of Carrizo Creek, Cahfornia; and marine Miocene of the 

 Atlantic and Gulf slopes. Does not include so-caUed ' 'Arctic Miocene " nor ' ' Old Miocene," 

 both of which are included in "Marine Eocene." Marine Pliocene of the Coast Ranges of 

 Cahfornia; Humboldt formation (nonmarine) of Nevada; and marine Pliocene and Lafay- 

 ette of the Atlantic and Gulf slopes east of the Mississippi, including the Altamaha of 

 Georgia; also Yucatan. 



Later Tertiary areas. 



Page. 



B-0 18 Colombia 796 



17 Banama. (See Chapter XVI, pp. 711-714.) 



E 14-15, F 14, 16, G 12, 14, H-T 11. .Mexico (in part mapped with Quaternary) 797 



E 14 Oaxaca 797 



E 15 Chiapas 797 



F 14 Vera Cruz and Hidalgo 797 



F 16 Peninsula of Yucatan 797 



F-G 12 Lower California 799 



G 14 Tamaulipaa 799 



H-I 11 Tia Juana, Lower California 799 



E 18 , Jamaica 799 



E 19. Santo Domingo and Porto Eico 801 



F 17-18 Cuba 803 



G-H 14, H-I 15 Texas, Louisiana, and Arkansas .".. 804 



G 17, H 16-17, I 15-17, J 16 South Atlantic and eastern Gulf Coastal Plain and north end of Mississippi 



embayment 806 



H-J 13-14 Great Plains, Colorado, Kansas, Oklahoma, New Mexico, and Texas. 813 



1 10-11 Santa Barbara and southern California 814 



I-J 10-11 Coast Kange, California 815 



J-K 11 Nevada, OregoUj and Idaho 819 



KIO Northern California 820 



K 11-12 Nevada, Utah, and Idaho. (See also K-L 11.) 820 



K 13-14 Northern Great Plains, Wyoming, Nebraska, and South Dakota 821 



K 18 ,......, Long Island (not mapped) 823 



794 



