Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . older sedimentaryrocks. The Pliocene marls referred to do not extend as far as our dis-trict. Dr. Endlich will treat of their occurrence near South Pass. The shore-line of the ancient lake was undoubtedly granitic, as is shownby the character of the deposits. The older formations probably occurin the central portions of the basin, where they are concealed by theTertiary strata. The Wind River Range be
Eleventh annual report of the United States Geological and Geographical Survey of the Territories : embracing Idaho and Wyoming : being a report of progress of the exploration for the year 1877 . older sedimentaryrocks. The Pliocene marls referred to do not extend as far as our dis-trict. Dr. Endlich will treat of their occurrence near South Pass. The shore-line of the ancient lake was undoubtedly granitic, as is shownby the character of the deposits. The older formations probably occurin the central portions of the basin, where they are concealed by theTertiary strata. The Wind River Range belongs to the same system asthe Front Range of Colorado, and probably like it stood above thelevel of the water in very early time. I have in other places indicatedmy belief that the Rocky Mountains of Colorado were affected by asubsidence extending through a long period of time, and I think it prob-able that the Wind River Range partook of the same movement, andthat its present elevation is due to an elevation in Post-Cretaceous Hay den was inclined to consider the Sweetwater Valley an extensionto the east or southeast of the axis of the Wind River Range. If so, it JPlate G-reerj Geological. Surrey. Plnte. JCLVUL
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