 Three ledges of gray, somewhat compact limestone, each about a foot in thickness. These are separated by thin seams of soft marly material. The upper ledge has dark nodules of chert which contain numerous small fragmen's of organic structures.. . 3. 1....  Annual Report for ... with Accompanying Papers - Seite 214von Iowa Geological Survey - 1901Vollansicht - Über dieses Buch
 | Iowa Geological Survey - 1901 - 598 Seiten
...Fusutina cylindrica, Lophophyllum proliferum, Productus longispinus, Khombipora tepidodendroides , Seminula argentea 5. 4. Dark and greenish shale, not...and contains a Pinna, frequent small specimens of Susulina cylindrica, and some crinoid stems. In the Sw. i of the Sw. i of Sec. 14, Macedonia township,... | |
 | 1901 - 582 Seiten
...small f ragmen's of organic structures.. . 3. 1. Yellow limestone of soft texture with many fusulinas, exposed 3. About two feet of the lower ledge in this...contains a Pinna, frequent small specimens of Fusulina cylindrica, and some crinoid stems. In the Sw. i of the Sw. i of Sec. 14, Macedonia township, Mr. Hartson... | |
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