Field Notebook: USA 1995a
Page 87
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
5/22/95 @ Holland (1993) locality Caesar Lake Spillway (+ fail) Spillway sections: Holland 1973, saw about 27' + f limestone and siltstone with numerous bryoz., cracks, and burrows. Some beds have wavy bedded lower surfaces, some have wavy bedded upper surfaces, some have both. One or two beds have conchoidal fracture, 2" to 5" + thick; these can only be traced for about 30 to 40 yards before they are truncated by ripple surfaces. Two kinds of bryozoa in general, smaller ones near base of section, & several species; larger "Homotrypa" are extensive near top. "Dictyons", Herbertella?, large solitary corals common. Those have a cyclicity of 2' to 5' f v. silty ligament & thinner siltstones. "Several" collections There are 6 or 7 (click photos) of these cycles which are more silty in the lower 1/2 and then become less silty upwards. 3 collections 5/22/95/A - float from wall of spillway (walked across flat) 5/22/95/B - N side of roadway float 5/22/95/C - on top of road in place. Same units as at Wright Bros. Mem. Hill RR - more red, weathered zone. Dict is below this cut