ORIGIN AND DEFINITION OF THE TERM “LARAMIE” 527 
the hearts of the surrounding ranges. This unconformity thus 
involves the total thickness of the Cretaceous portion of the beds 
below the unconformity, and probably the whole sedimentary series 
of this region, or over 20,000 feet of strata. 
The Laramie Plains section in brief is as follows: 
GENERALIZED SECTION OF THE ROCKS OF THE WESTERN PART OF THE LARAMIE 
PLAINS IN CARBON COUNTY, WYOMING 
INortheParkwlentianys tec 22 ili Son tieee ans) aed ag 4,500+ 
Unconformity .. 5 avis 
HORMUMON Re: Sere ee nee aa: er Ane ee OO —2"OOO 
(AO per eararmMie yea Se es eeu omy ic Jae 6,000 
Unconformity . es 
BIS QWelelearammley ie ets choy eve ner Gade tenement 6,500 
Ne te ae “Fox Hills” of the early surveys | Eee 
sOPictresshales aunt he, cee ee en ete AG, 3,500 
ees Niobrara ath ccecs emi sige hen chide cee ame Oh ate 800 
Bento mira a te ame ie alienate Ghar awit hake cama 1,500 
DD) AOtaeeercem es ear ata ae ee ee ART eR Rea Oe 150 
INPOTGISOM pate mach state res fukin sigh hoe Mere aE eens 200 
ViaTanenURASSIC A Pri ka es ae ect cee a tenet 75 
Rredigbe dS Weare leave Scop 05 Se SSSI Age Ugh RS eae aes 1,650 
Carboniferous sandstone and limestone with basal con- 
glomeraticnquartziter |. yam (7 ocu lf ae ae 1, 800 © 
Pre-Cambrian crystallines 
It may be said that in the areas examined by the Hayden and 
King parties, all of which were immediately along and south of the 
Union Pacific Railroad, the lower division is usually absent, the upper 
resting generally on one or another of the members of the Montana, 
but at one point extending over on to the Dakota. The large develop- 
ment of the division beneath the unconformity and above the Mon- 
tana, corresponding to the “Lower Laramie” of literature, lies 
entirely north of the area they studied, and its existence was not 
known until the work of the past season. 
t It is the belief of Dr. T. W. Stanton that the Mesa Verde and part of the Lewis 
belong to the Pierre, as that formation is developed east of the Rocky Mountains. 
A local name will therefore be.applied to this lowest division of the Montana in this 
section. 
