The Quarterly journal of the Geological Society of London . zogthum Hessen, v. Friedr. Voltz, Mainz 1852. Uebersicht dergeologischen Verhaltnisse des Herzogthunis Nassau, v. Dr. Frid. Sandberger,Wiesbaden 1S47. Untersuchungen iiber das Mainzer Tertiar Becken, v. Dr. , Wiesbaden 1853 (published and received in London long after thecommencement of this paper). 1854.] HAMILTON MAYENCE BASIN. 261 heim, this sand, which is there coarse and shelly, alternates withbeds of hard compact limestone, also fossiliferous, although, in suchcases, it is almost impossible to extract their contents.
The Quarterly journal of the Geological Society of London . zogthum Hessen, v. Friedr. Voltz, Mainz 1852. Uebersicht dergeologischen Verhaltnisse des Herzogthunis Nassau, v. Dr. Frid. Sandberger,Wiesbaden 1S47. Untersuchungen iiber das Mainzer Tertiar Becken, v. Dr. , Wiesbaden 1853 (published and received in London long after thecommencement of this paper). 1854.] HAMILTON MAYENCE BASIN. 261 heim, this sand, which is there coarse and shelly, alternates withbeds of hard compact limestone, also fossiliferous, although, in suchcases, it is almost impossible to extract their contents. A few of Weinheim, between the villages of Offenheim and Becken-heim, is a good section of this marine sand, overlaid by thin bedsof blue and mottled clays, close to the very edge of the basin, asshown in the neighbouring quarry (only a few paces above it) ofmicaceous sandstone-grit, evidently belonging to the Carboniferoussystem. The accompanying section, fig. 5, will show the relative Fig. 5.—Section of the Marine Sands and Cyrena sc. 2. 1. Marine sands. position of these beds. This spot, which had been opened apparentlyas a sand-pit, offered the following section in descending order: — ft. in. Upper blue clay, with septaria 0 4 Brown clays 1 0 Second band of blue clay 0 1 Brown clay, with small nodules of phosphate of lime ? . 11 Ferruginous clay 0 4 Lowest blue clay, with traces of vegetable matter .... 0 9 Ferruginous clay 0 4 Ferruginous sand 3 4 White sand, with ferruginous streaks 10 0 —the latter in fact extending to the bottom of the pit, as far as wasexposed, and probably much deeper. It should be observed, thatin this pit we found no fossils whatever, nor even a pebble or otherextraneous matter. To the E. and the same beds are seenstretching away from the ancient shore, and increasing in thickness;and at no great distance we found in a bank by the road-side asection nearly on the same level as the sand-pit, in
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectgeology, bookyear1845
