170 PROCEEDINGS OF THE ALBANY MEETING 



zons may be correlated, and that they may indicate a general unconformity 

 between the true Pennsylvanian and the rocks of questionable age overlying it. 

 The erosional unconformity at the base of the Manzano, the angular uncon- 

 formity between the Pennsylvanian and Permian in the Arbuckle Mountains, 

 in southern Oklahoma, and comparable relations elsewhere, seem to warrant 

 the belief that these unconformities may be due to a diastrophic movement 

 which appropriately constitutes the division between Pennsylvanian and Per- 

 mian time. 



AMSDEN FORMATION OF WYOMING AND ITS FAUNA 

 BY E. B. BKANSON AND D. K. GREGER 



(AJ)Stract) 



The main outcrops of the Amsden occur in western Wyoming. Its fauna 

 contains many species characteristic of the Meramecian of the Mississippi 

 Valley, together with some species that foreshadow the appearance of Penn- 

 sylvanian types. 



Presented in abstract extemporaneously by the senior author. 



REMARKABLE GEOLOGIC SECTION NEAR COLUMBIA, MISSOURI . 

 BY E. B. BRANSON 



(Abstract) 



Nine formations, ranging from Lower Ordovician to Middle Mississippian in 

 age, are exposed in a distance of one mile, in bluffs about 150 feet high, along 

 the north side of the Missouri River, near Columbia, Missouri. The total ex- 

 posed thickness is about 200 feet, and seven of the formations are separated 

 by unconformities. 



Presented in abstract extemporaneously. 



SATSOP FORMATION OF WASHINGTON AND OREGON 

 BY J. TIARLEN BRETZ ^ 



(AI)Stract) 



The Satsop formation is a wide-spread fluviatile deposit in the river valleys 

 of southwestern Washington, in the Columbia River Valley for at least 200 

 miles above the mouth, and in the lower Willamette Valley of northwestern 

 Oregon, and is a coastal deposit exposed at intervals along almost the entire 

 Pacific coast of Washington and Oregon. It exists inland at least as far as 

 the Yakima Valley, a tributary of the Columbia, on the eastern flank of the 

 Cascade Mountains of Washington. 



From stratigraphic relations and contained fossils the coastal phase of the 

 Satsop formation is known to be of Quaternary age. In the Coast Range it 



' Inti-odiiced by K, I), Salisbury. 



