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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
The Problem of the St. Peter Sandstone (5-6)

The Problem of the St. Peter Sandstone (5-6)

Dake, Charles Laurence

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Fiction Anthologies

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ISBN10: 1150630507
ISBN13: 9781150630507
Publisher: General Books
Pages: 186
Weight: 0.62
Height: 0.42 Width: 9.01 Depth: 5.98
Language: English
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 Excerpt: ...of Orthis (Pianodema) subaequata, and two bryozoa, Sticotporella frondijera and 5. angularis, elsewhere characteristic of the Decorah. Faunal liscs in the older reports are subject to interpretation. The Trenton of Wisconsin, as of Iowa, included noc only the Platteville, but also the Decorah and much of the less crystalline lower part of the Galena, as these formations are now delimited. Old lists of Trenton fossils are therefore commonly of but little importance in close correlation. One such list, however, separates the forms found in the Lower Buff, Lower Blue, Upper Buff, and Upper Blue. As near as can be told from careful comparison of older and more recent published descriptions, the first two, the Lower Buff and Lower Blue, are very nearly the equivalents of the present Platteville, including the Decorah. In fact in the report on the Geology and topography of the Lead Region, Strong restricts the term Trenton to these two horizons. Also the average thickness of the Platteville is about equal to the average thickness of the Lower Buff and Lower Blue taken together, which further confirms the belief that these two make up the present Platteville. Chamberlin's191 list from these two horizons is therefore appended, as the best available. Geology of Wisconsin, vol. 2, p. 680. i 'Geology of Wisconsin, vol. 2, 1873-77, pp. 320-326. fauna of Lower Duff and Lower Blue. Platteville. Range. Palaeophycus gracile (1) T Buthotropis succulens (1-2) Tr. Schizocrinus nodosus (2) Tr. Stictopora elegantula (2) Tr. Lingula cf. obtusa (1) Tr. Orthis disparilis (ignicula) (1) Chazy. Orthis perverta (1-2) (...

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