Mr. Rose's Sketch of the Geology of West Norfolk. 1 79 



deposits of the fens, and have been seen at Hilgay only, upon 

 sinking wells. 



A section from Bilney Lodge to Blackborough, cutting the 

 strike of the inferior greensand at right angles, would exhibit 

 the following succession of beds, beginning with the upper- 

 most : 



1. The six beds exposed at the well near Bilney Lodge. 



2. Loose sand, occurring in the low ground of Bilney 

 Common. 



3. Carstone, extending from East Winch to Blackborough 

 Pit. 



4. Loose variegated sand, appearing at the base of the hill 

 in which the above pit is situated, and towards the west. 



Mineral Contents. — In addition to the ironstone already 

 mentioned, we meet with a form of iron pyrites very unlike 

 that from the chalk strata above, or the Kimmeridge clay be- 

 neath ; its form is spherical, outer coat brown, and its frac- 

 ture granular, with a very light pyritous lustre: it is rarely 

 seen. Titaniferous oxidulated iron was found at Hunstan- 

 ton by Mr. Aikin. I have not at present discovered any 

 chert. 



No animal remains have yet been found. Small fragments 

 of wood are occasionally found imbedded in the carstone; 

 and Mr. Muggridge gave me a portion of sandstone from 

 Snettisham, having on it an impression of the stem of a Lyco- 

 podite?. 



Gault. — This bed, the " golt brick-earth " of Smith, suc- 

 ceeds the inferior greensand, and reposes upon it. It occu- 

 pies, with the lowest beds of the chalk above, the valley be- 

 tween the ranges of chalk and greensand, emerging from 

 beneath the western edge of the former. 



Upon referring to the map and section in the 6 Outlines of 

 the Geology of Norfolk', it will be seen that this stratum is 

 omitted ; in justice to Mr. Woodward, I here state, that I be- 

 lieve I am responsible for that omission, that gentleman hav- 

 ing probably relied upon my local knowledge of Western 

 Norfolk. At the time I communicated with him, I entertained 

 great doubt of there being a regular stratum of gault in this 

 county, not having met with any other fossil than the small 

 Belemnite in the " golt brick-earth" of Smith, — nor, indeed, 

 have the other characteristic fossils* of the " gault of Cam- 

 bridgeshire" yet been found; but when I had the good for- 



* Tnoceramus concentricus and Inocer. sulcatus. Since writing the above, 

 I have ascertained that Inocer. sulcatus has been found in the red beds at 

 Hunstanton. 



2 A2 



