59 



Brownisli clay, about 3 feet. 

 Shelly gravel, witli false-bedding, 2 feet shown. 

 Talus and water, apparently hiding the base of the gravel and 

 its junction with blue Boulder Clay below *. 



The uppermost clay was certainly not Boulder Clay, but true 

 Glacial Clay was seen below the gravel in other parts of the 

 pit. 



A good section was observed by Mr Skertchly in Hutchison's 

 brickyard, and noted as follows^ 



Gravel, with marine shells, now almost removed, fonnerly from 

 6 to 20 feet thick. 



Boulder Clay, dark blue in colour, with many rounded and 

 striated chalk-pebbles. 



Kimmeridge Clay, dark blue, with Ostrea deltoidea in the upper 

 part, dug to 40 feet.] 



Mr Skertchly has not seen anything like true Boulder Clay 

 overlying the gravel either in this or in any other pits, and 

 agrees with me in thinking the whole series to be of Post-glacial 

 age, and the general relations of the gravel to be as shown 

 in Fig. 5. 



Fig. 5. Diagram Section across the March Gravels, 



a — Kimmeridge Clay. 6 = Boulder Clay. c = gravel. 



d = loam. f—ien series. 



About half a mile north of the Station are more recent 

 excavations, showing flue gravels and sands full of marine shells ; 

 they are overlaid near the railway by a bed of yellowish loamy 

 clay, somewhat similar to that mistaken for Glacial Clay by 

 Prof. Seeley and possibly once continuous with that deposit. 



I collected iu these pits the following shells : 



Ostrea edulis. Buccinum undatum. Bela turricula. 



Cardium edule. Purpura lapillus. Littoiina littorea. 



Tellina solidula. Turritella communis. Natica Alderi ] 



1 Having lost my notes of this section, I am indebted for the above details to 

 Prof. Bonney, with whom I visited the locality, 



2 See Geology of the Fenland, p. 192. 



