Chapter XIV. 



LOWER CRETACEOUS. 



Color, Medium green. 



Symbol, 8. 



Distribution: Atlantic, Gulf, and Caribbean coasts; New Jersey to South. America; Pacific 

 coast, Alaska to South America. In Mexico areas mapped include Upper Cretaceous. 



Content : Potomac group of the Atlantic slope, Georgia, and eastern Alabama ; Comanche 



series (comprising Trinity, Fredericksburg, and Washita groups) of Texas, Oklahoma, and 

 Mexico; Shasta series (Knoxville and Horsetown formations) of California and Oregon; 

 Queen Charlotte group of British Columbia; Kootenai formation of the Kocky Mountains,, 



Montana northward to fifty-second parallel and beyond ; Lower Cretaceous, Alaska. ■; ' 



Lower Cretaceous areas. 



Page. 



B-C18 Colombia 581 



B-C 19-20 Venezuela 583 



C20. Trinidad 584: 



C 17, D 16 Honduras and Costa Rica , 585' 



D-E 15-16 Guatemala and Chiapas 585 



E 14 State of Vera Cruz, eastern slope of the Mexican Plateau 587 



E 15 - Isthmus of Tehuan tepee 588 



E-H 12-15 Mexico in general ; 589 



P 14 San Luis Potosi 591 



G 13-14 Sierra de Mazapil, Zacatecas 592 



H 12 Southeastern Arizona and Sonora 592 



H 13 Quitman Mountains, trans-Pecos Texas 594 



H 13 Chisos region, Texas 595 



H 13 Texas, near El Paso, and Chihuahua, Mexico 596 



H 14 Llano-Burnet region, Texas : 598 



H-I 14 Central Texas 601 



I 14-15 Northern Texas, southern Oklahoma and Arkansas, and northern Louisiana. . . 604 



1 16-17 Alabama, Georgia, and South Carolina 605 



I-J 13-14 Eastern New Mexico, Oklahoma, and southern Kansas (not mapped) 606 



I-K 13: New Mexico, Colorado, and Wyoming (not mapped in general) 606 



I-K 17-18 Atlantic Coastal Plain, Massachusetts to North Carolina, inclusive 608 



J 14 Central Kansas (not mapped) 614 



J-K 10 California 615 



K 10 Klamath Mountains, Oregon and California 617 



L 10 John Day Basin, Oregon 621 



L 12 Southwestern Montana (not mapped) and central Montana 621 



M 10 Washington and British Columbia 623 



M 11-12 Canadian Rockies, Alberta and British Columbia 624 



M 10, N 9-10, 9 Western British Columbia 625 



N 8-9 Queen Charlotte Islands 628 



N 9 Telkwa River district, British Columbia 630 



N-0 4 Alaska Peninsula (mapped with Triassic and Jurassic) 631 



8 Southeastern Alaska _ 632 



0-P 4 Lower Yukon and Kuskokwim basins, Alaska 633 



P 8 Southern Yukon Territory and British Columbia (not mapped) ' 634 



Q 4-5 Koyukuk basin, Alaska 635 



Q 7 Upper Yukon, Alaska 635 



R 3 Cape Lisburne, northwestern Alaska 636 



R 5 Northern Alaska, Arctic slope 636 



579 



