The Quarterly journal of the Geological Society of London . ellsare perforated. 240 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 3, 1867. Terebratula biplicata, Sow. obesa, Sow. Terebratulina gracilis, Schl. Ehynchonella Mantelliana, Sow. Exogyra. Ostrea. Plicatula inflata, Sow. (?) Casts of several other bivalves. Holaster subglobosa, Leske, sp. Micraster. Ananchytes. Discoidea cylindrica, Lam. Diseoidea subuculus, Bronn. Cidaris gceptrifera ? (spines). Spines of several other species of or Yermicularia. d. Other Beds of Bed Chalk.—Besides the beds already described,there are
The Quarterly journal of the Geological Society of London . ellsare perforated. 240 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 3, 1867. Terebratula biplicata, Sow. obesa, Sow. Terebratulina gracilis, Schl. Ehynchonella Mantelliana, Sow. Exogyra. Ostrea. Plicatula inflata, Sow. (?) Casts of several other bivalves. Holaster subglobosa, Leske, sp. Micraster. Ananchytes. Discoidea cylindrica, Lam. Diseoidea subuculus, Bronn. Cidaris gceptrifera ? (spines). Spines of several other species of or Yermicularia. d. Other Beds of Bed Chalk.—Besides the beds already described,there are a number of chalk-pits in Lincolnshire where layers of amore or less decided red colour are seen. These for the most part donot present any special points of interest. In the deep chalk-pit at Tetford Hill, however, we have a pink bedwhich extends over a considerable area, like the Louth red chalk, ofwhich bed it may possibly be a continuation. The sketch (fig. 2)shows the succession of beds in this pit. Fig. 2.—Section of a ChalJc-pit at Tetford HilL. ^r?fjii^.y^.f// ^==3zrt— ? —1—— ~T imzzn—\iill ^ _ -^^^j™^^^^^^^^i^,iiMiiii,iiiiii^^ ^^-^f^:^-::^ 10 1. Soil. 2. Chalk rubble. 3. Soft white chalk in small pieces. 4. Pale pink chalk similarly shattered, graduating into the white above and below Thickness = 6 to 6 feet. 5. Soft white chalk 2 feet. 6. Very hard white bed 2 ,, 7. Drab bed (arenaceous chalk) 1 foot 6 in. 8. Knobbly white bed^ 2 feet. 9. Very white chalk 12 „ In the midst of this occurs a covuse of hard undividedchalk, called by the workmen Pot chalk, or Eingingchalk, from its ringing under the Nodular chalk, in which the workmen have bored morethan 30 feet. The only fossil I could find in the red bed was Terebratula obesa, Sow,The white beds contained many fossils. In the bed 7. a new andpuzzling fossil (possibly a Hippurite) occurs. Fig. 3.—Corrvparative Sections of the Lower Chcdh
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
