Field Notebook: CO 1955
Page 21
Image from the Biodiversity Heritage Library. Contributed by Yale Peabody Museum of Natural History. | www.biodiversitylibrary.org
Transcription
Sec.55-5 This is in gulley at loc. #1. It may be Finlay's type Glacisira. Along the old railroad over hill to north it is completely cut out and Lytle is faulted against Dakota. Here, however, there is a complete section up from Lytle Starting base of "Dakota" (= Kessler, and has some peculiar markings at base as does type Kessler.) Base ss unconformity 14) 2.5 Interbedded siltstone and silty shale, irregularly laminated and thin bedded, Weathers blue-gray 13) 0.3+ Porcellanite 12)-> 14.7 Shale, dark grey clay, silty at top and base. upper 0.4 is siltstone with thin porcellanite under it. Scattered thin beds of fine-gr. sandstone and siltstone in lower 3.5. 11) .7 Sandstone, silty, fine-grained, Fe impregnated cap on underlying unit - stands out as purplish conc. layer. 10) 12.7 Siltstone and fine-gr. sandstone, An 9