Field Notebook: SD, ND 1962
Page 47
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
of crumbly gray silt jackets occur locally in leveeite layers. 6) 17.0 Lower 5.0-6.0': chiefly dull gray clayey silt locally shaley. Above gray to yellowish or light brownish gray sandy, clayey silt, sand vfg increasing upward as clay content decreases upward. At. 9.0-9.5' scattered red weather is common. And at top is Big spheno cone. layer. Both cone layers loc. jacketed. Big spheno layer 7) 5.7 As in 6) below to base layer scattered large cone masses, vfg sand & silt that weather pinky to flashy gray to brown. Some of these cones is more sandy than preceding interval. Section 2. On toe of SW trending spur to ridge Beginning at top of big spheno layer. 1) 5.2 Gray to yellowish gray vfg sandy silt with some clay and blobs dull silty silt. weather light yellowish gray. 2) 9.3 Intermixed, mottled gray to yellowish gray vfg sandy silt and gray silty clay. Whole is clayey, less sandy than interval 1). At 5.3-5.5' and in top 0.2' are OB stained zones mottled silt & vfg sand.