Lower Peninsula, 1873-1876 : accompanied by a geological map . PLATE LI. Upper tier, Streptelasma corniculum. Four specimens on left side from the Trenton group of of seven specimens on right side found in the Hudson River group ; the largest one on Drummonds Island, the others at Richmond, tier, upper central specimen, and lowest one in the right corner, Zaphken- TIS UMBONATA. Other specimens, excepting the left outer and the third in the lower row, areforms of Zaphrentis Stockesii, found at Point Detour, in the Niagaragroup. The two excepted lower specimens on th
Lower Peninsula, 1873-1876 : accompanied by a geological map . PLATE LI. Upper tier, Streptelasma corniculum. Four specimens on left side from the Trenton group of of seven specimens on right side found in the Hudson River group ; the largest one on Drummonds Island, the others at Richmond, tier, upper central specimen, and lowest one in the right corner, Zaphken- TIS UMBONATA. Other specimens, excepting the left outer and the third in the lower row, areforms of Zaphrentis Stockesii, found at Point Detour, in the Niagaragroup. The two excepted lower specimens on the plate are not nearer determined. /. PLATE L I I. Zaphrentis gigantea. Corniferous limestone, Falls of the Ohio. PLATE LI I
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectgeology, bookyear1876
