488 



ME. A. STRAHAlvr ON THE LIlS'COLIirSHIRE CAKSTONE. 





&JD 











o 



S^ 











X 



o 







^ 



0) 



M 



. 



gg 







M 





s 



-^ 



O J.J 



i?n 



^ 





^ 



c 

 S 





02 



o 







c ^ 







"1 



1 

 1 



-S ■ 

 S 





,^ 



Ul 



j 





§ 







p^ 







m 







<1 



a 



1^5 











ft. 



ft. 



ft. ft. 



ft. 



ft. 



ft. 



ft. 



ft. 



ft. 



Eed Chalk 



10 



n 



fiS 5 



9 



4 



4 



4 





 



3-4 



Carstone 



19^ 

 219 



40 

 135 



25 



65 



14 

 60 



10 



68 



10 

 40 



11 

 23 





 10 



1-3 



Tealby Beds 



Spilsbj Sandstone... j 



Sand 19 

 Clay 23 



Uo 



42 



30 



7(?) 



35 



24 



15 



9 (about) 



10 



In the Skegness boring the Tealby Beds consisted chiefly of clay, 

 crowded in some parts with spherical grains of iron-oxide. The 

 Spilsby Sandstone (a very constant bed along the outcrop) was 

 unexpectedly thin, owing apparently to its partial replacement by 

 clay ; it was also finer in grain than it is further west. 



Section No. 9 (fig. 1) shows the general thicknesses at the south 

 end of the Wolds. In this part a calcareous and ferruginous stone 

 appears in the upper part of the Tealby Beds, and forms a well- 

 marked feature in the hill-sides. The lower part of the clay is 

 crowded with spherical grains of iron-oxide. The Spilsby Sandstone 

 is based by a " coprolite-bed," made up principally of casts of common 

 Kimeridge-clay forms. This nodule band is continued through the 

 whole area, and without doubt indicates the erosion of a portion of 

 the Kimeridge Clay before the deposition of the Speeton Series. 



Section No. 8 shows the position of the Tealby Limestone. 

 Though not actually continuous with the ferruginous limestone of 

 the south end of the Wolds, it is similar to it and appears at about 

 the same horizon. The Carstone here begins to assume more 

 distinctly a conglomeratic character ; it contains a pebbly band, 

 four or five feet thick, made up of well-rolled nodules of a pale bluish 

 phosphate of lime, a few of which are clearly internal casts of 

 bivalves. The base of the Carstone is seen near Otby (between 

 Sections 8 and 7) to be formed by a nodule-bed, about six inches 

 thick, made up of large rolled phosphatic nodules, which contain 

 casts of Ammonites believed to be of JSTeocomian species. Ammonites 

 speetoiiensis (?) four specimens, Am. plicomplialus (?) one specimen, 

 Lucina (?), and others, and a Gasteropod were collected here *, and 

 have been identified by Mr. Sharman. Many of the nodules also 

 contained the spherical grains of iron-oxide so common in the 

 Neocomian clays. The nodule-band rests on pale-blue or grey 

 Neocomian clay crowded with iron-grains. 



^ Mr. Keeping informs me that he found the following specimens occurring 

 as pebbles in the Carstone at Claxby, about five feet below the base of the Red 

 Chalk: — Ammonites Deshayesi, Leym., A. tTi])lex, Sow., Meguienia'i , Astarte, 

 Corbula, Modiola, Myacites, Pholadomya, Cyj^rina, Teredo. 



