Inasiiii^J 



TRIASSIC 



(Aiojuie deposi/s til western Nmih Aiiwriiii . 

 Mejciio.njid the, Arctic, redbeds of Teaas, 

 NewMe.vico.anti MeA:it'(>:Ni'warl< <iii<up 

 oft he Atlantic Coast.A/aririe 7}i<issic 

 ui Coiuitlitin Rockies mapped wit/i llw 

 Paleozoic nndi vided. Elsewhere com- 

 hiiieA with the Jirrassic) 



TRIASSIC AND JURASSIC 



llxfil hiul s iil((l iiDiriiic ili'/iiisifs III 

 I he (iiiihllrni.ciiniprisiNf/ JiirossK', 

 Triiissic iiikI I'mn I (III iiiiirine Iriiissu 

 I UK I Jill ii ssi,- I'l IIk' J'licilic where iinl 

 srpiii ii/iil I 



^ 



/ / 



22" 



V«> 



fo 



18 



C/5 



O 



tr 



UJ 

 Ll. 



z 

 o 



CD 



< 

 O 



11 



^ ^ 



PERMIAN 



( Lifiiesl<ines oml re<l bett^s. Kansas to 

 iVew Afe.iieo ami the Blaek lldls.DunA 

 ard ol^t/ie norther-n AppahieJuaiis, 

 New Ida scow and associated sand 

 s ton es III ca s tern i aria da. KIs ewli ei e 

 niappcil wdh I \uiionil'eiou,s uruUvided 

 Red beds injclude sonve Triassi/:') 



12 



o 

 o 



N 



o< 



UJ 

 -I 

 < 

 Q. 



16" 



14" 



PENNSYLVANIAN 



(('oid nieasnres.l'ottsvdle biMcmoncfa 

 hela. ol' eastern North America and 

 their e<f luvaienls where separatedon. 

 the map) 



13 



MISSISSIPPIAN 



( Lower I 'arbonileraus'li/nestones an il 

 their eifnivulents where sepaiateil mi 

 the iniL/i Horn the f'cnnsvlvtuiian I 



15 



DEVONIAN 



(Heldertjefi] to Idiemung; (generally in op 

 ped with Carbonil'erous in western 

 A\'ar(/t ^{merica. Includes Siluruui in 

 southern Appala4:hian-sJ 



16 



SILURIAN 



(Medina to Cayuija.in tlte Arctic includes 

 t)/-doyici<wi;in the southern Afipalachian s 

 mapped with DevoniAin, and in the Cor 

 dillera Qenerally m apped with Cambrian 

 and lower ttrdoi ician) 



17 



MIDDLE AND UPPER ORDOVICIAN 



(Chazy to Jiich/nond.Alappcd with 

 Silzir-ian in theArcHc and with Cam- 

 briiui ojid lower (Jrdovieian in tlie 



Rocky MoiuU^wis of the Ignited States) 



"\ 



14 



CARBONIFEROUS, UNDIVIDED 



ILimestones ol western jVo/th America, 

 New Icauid land, and the Arctic: do ah t 

 till CarboniferoiLS otCentral America, 

 .'^ididiyiiled in eastern Nor th America/ 



19 



PALEOZOIC, UNDIVIDED 



//n riiirthern Cordiller'a,wher'e 

 ilala lor separahon on the map 

 are lackiriyj 



X 



20 



METAMORPHIC PALEOZOIC 

 UNDIVIDED 



flxnown or- supposeddhlciizoic rcicks 

 in northern Cordillera,riorthern 

 ^\iipala.chi4ins, and \^eriezuelaj 



IGNEOUS ROCKS 



E 



25 



TERTIARY AND LATER 

 EFFUSIVE ROCKS 



{Volcanic r-ock-s and Ui vas thrmi <di<>ul 

 the Cordiller-ii.frorii ( 'erdral ^hncr-ica 

 bo Aleutian Islands-, Venezuela<tnd. 

 WuidM'atd Islands; (ir-eeriLmd and 

 Iceland Inrlu des some in/7nsive 

 r-ocks id siiinc agel 



POST-CAMBRIAN INTRUSIVE ROCKS 



(J'lulunic rocks, chiclly (jramles.in 

 eastern Norih America, the ( nrdillera 

 frxnii Sunt h America to Alaska , and 

 SanlJomiiii/o Includes some ctliisive 

 rocks of same age arul some older' 

 inti'usivesj 



V 



PRE-CAMBRIAN INTRUSIVE ROCKS 



(I'Udonic rocks ui easteiyi North 

 Amerioa ii/id Oklahoma. Includes 

 some eyffiisive rricks of same age. 

 El^eM-here mapped with associnled 

 pre t'anibr'ian rvcksj 



23c 



V GNEISSES, SCHISTS, AND 

 ' METAMORPHOSED SEDIMENTS 

 (Supposed pr'e Can ibrxan, possibly 

 in part Paleozoic and Mesa zoicj 



