32 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1960 



200-raeter oblique plankton tows at each station. Also at each of the 

 stations they took a separate tow for pelagic Foraminifera, using a 

 specially designed i/^-meter net with a guard at the forward end. This 

 is a particularly interesting traverse because it crosses diverse water 

 masses, including the Sargasso Sea, the Gulf Stream, the North 

 Atlantic Slope Waters, and the Eastern North Atlantic Coastal 

 Waters. Each water mass appears to be characterized by a distinctive 

 assemblage of Foraminifera. From this and further scheduled trips 

 Dr. Cifelli expects to gather more data on the distribution of North 

 Atlantic pelagic Foraminifera and on factors responsible for their 

 distribution. 



During the first half of June Dr. Cifelli, accompanied by several 

 members of the U.S. Geological Survey and the Canadian Geological 

 Survey, visited several western States to examine important marine 

 Jurassic sections. The party studied the Jurassic stratigraphy at 

 sites in Wyoming, Montana, and Idaho. Dr. Cifelli collected 130 

 foraminif eral samples from the shales in the Jurassic formation. 



Henry B. Roberts, museum aide, in mid-January visited the Acad- 

 emy of Natural Sciences at Philadelpliia to study various primaiy 

 types of fossil decapods and barnacles. The Academy's collections 

 in these fields contain important historical material particularly use- 

 ful to Mr. Roberts in his researches. 



Dr. C. Lewis Gazin, curator of vertebrate paleontology, accom- 

 panied by Franklin L. Pearce, exhibits specialist, devoted about a 

 month early in the year collecting fossil vertebrates in southwestern 

 Wyoming and adjacent Utah. Dr. Gazin traced the Sage Creek 

 White Layer, which marks the boundary between the upper and lower 

 Bridger formation from the type section of Cottonwood Creek around 

 the basin to its most easterly point on Twin Buttes. This study has 

 considerable significance in properly correlating many of the collec- 

 tions made from various localities in earlier years and correcting 

 errors on a map prepared by Matthew and Granger about 50 years 

 ago. Collecting was largely concentrated in the lower or Bridger 

 "B" levels on both sides of the basin, but localities visited outside the 

 areal extent of the Bridger formation included a lowermost Eocene 

 fossil occurrence just south of Bitter Creek Station on the Union 

 Pacific Railroad, a previously veiy productive locality for lower 

 Eocene mammals, about 12 miles north of Big Piney, Wyo., and a 

 series of nearly barren upper Eocene exposures in Norwood Canyon, 

 Morgan County, Utah. 



After the completion of his fieldwork. Dr. Gazin studied fossil pri- 

 mates at the Los Angeles County Museum. Later, September 10-12, 

 in Salt Lake City, he participated in the annual field conference of 

 the Intermountain Association of Petroleum Geologists. Between 



