Logan County Sec. 20, T. 15 S., R. 32 W

Measured By H. Miller and E. Gutentag
	Unit No. Description Thickness   Pierre Shale   1 Shale - fissile, dark gray, weathers to a medium gray, gypsiferous. Beds dip 25 degrees to the South Souteast at Eastern edge of out crop, dip is 15 degrees South Southeast at Northern edge. Section measured from fault-line contact with Niobrara up to top of exposed Pierre shale 104.5 ft.
Original Document Download an archival scan (file is 4-5 megs in size). The Archive file you download contains a TIFF image compressed into a ZIP archive. Your browser may be already set up to decompress these files. Commercial software to perform this is available from PKWARE, Inc., the company that invented the format. A web page from a group of people creating shareware or public domain software is available at Info-ZIP. The TIFFs are 150-dpi archival-quality color scans of the original forms and can be viewed by software like Corel PhotoPaint or Adobe PhotoShop.