Bentonites as Persistent Time Horizons in the Spechts Ferry Member of the Decorah Formation, Southwestern WisconsinUniversity of Wisconsin--Madison, 1952 - 68 pages |
Contents
Stratigraphy | 2 |
Tentonite in the Speclits Ferry | 12 |
Comparison of radioactivity of Spechts | 15 |
6 other sections not shown
Common terms and phrases
accessories activity addition alpha average background base basis bentonite bottom brown characteristic clay beds clay horizon clay material clay mineral clay-shale collected color Column colurnar section concluded considered consists containing correlate counts Decorah dense deposition dolomite expands fact feet Figure formation Forry fossiliferous four fraction glass green horizon idealized identified illite includes indicated Iowa Kerr and Kulp Lafayette County laterally limestone limestone beds lines lists LITHOLOGY localities lower unit marker measured by alpha middle unit moderately montmorillonite Number occur Ordovician outcrop Pennsylvania persistent physical properties Platteville Point position present probably Quarry quartz radioactivity readings recognized relative Rock samples sarples scintillation scintillometer section of Spechts sedimentary shown shows similar southwestern Wisconsin Spechts Ferry clay Spechts Ferry member Spechts Ferry shale stones stratigraphic structure studies Table thick thin tion type Average University of Wisconsin upper unit volcanic volcanic origin X-ray zones