GEOLOGY 



Section at Gayton 



Top of 

 bed from 

 sea-level 



Upper Lias, including soil 



Middle and Lower Lias 



Rh^tic : White Lias (14 feet), Black Shales (22 feet). Grey 



Marls ? (6 feet) 



Keuper : Sandstones and marls (53^ feet). Littoral deposits (22^ feet) 



Old Land Surface 



Lower Carboniferous : Limestones, sandstones, shales and marls 

 Old Red Sandstone ? Coarse red sandstones, grits and marls, 



dipping at an angle of 45° 



Greatest depth 



The Carboniferous Limestone Series 



There is no uncertainty with respect to the presence of rocks of 

 Lower Carboniferous age in Northamptonshire ; they were proved to be 

 190 feet thiclc at Gayton, and at Northampton a boring was stopped after 

 passing through 45I feet of them. It is interesting to note that in each 

 case they indicated, by an eroded top covered with fragmental deposits, 

 an Old Land Surface. Fossils were fairly abundant, and included fish 

 remains, cephalopods [Orthoceras) , lamellibranchs, corals, and wood. 



The boring at Northampton, referred to above, was also a trial one 

 for water by the Northampton Waterworks Company, made in 1879, and 

 below we give an abbreviated section similar to the last, compiled from 

 information in Mr. Eunson's paper.' 



Section at Kettering Road, Northampton 



Thickness 



in 



feet 



Top of 

 bed from 

 sea-level 



Northampton Sand, mostly slipped material 



Upper Lias, partly denuded 



Middle and Lower Lias 



Keuper : Sandstones, conglomerates, marls, and clays (Littoral 



deposits) 



Old Land Surface, dipping at angle of I 5° 



Carboniferous : Red and white dolomite (25 feet), red and yellow 



sandstones, limestones and shale (20^ feet) 



Greatest depth 851 



The Coal Measures 



So far the Millstone Grit and the Coal Measures have not been 

 found in Northamptonshire. Very plausible reasons have been given 

 for supposing that they were never deposited over a considerable area of 



' Henry John Eunson, ' The Range of the Palaeozoic Rocks beneath Northampton,' 

 Quart. Journ. Geol. Soc. (Aug. 1884), vol. xl. p. 492. 



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