EXCAVATION AT WATER WORKS PUMPING STATION. l8l 



At the base are seen the red marls, the excavation only cuts 

 into them for the depth of a couple of feet : above them are pale 

 green marls, which are evidently the same beds as in the Aust- 

 Cliff section come between the red marls and the bone-bed. 

 They are in the vertical sections of the Geological Survey classed 

 as Rhaetic. I prefer, however, to leave them in the Keuper, as 

 they are without fossils (except the mammal tooth at Watchet,) 

 the coming in of which in the Aust bone bed is so marked, while 

 they are identical in appearance with the green layers alternating 

 with the red marls. 



Taking into account the dip of the beds there is not sufficient 

 height for the Rhaetic beds to have cropped out before the red marls 

 of Hanbury and Alexandra roads come in, so that a fault must be 

 here as on the S. The dip of the Rhaetics was obtained not by 

 instrument, but from the different level of the beds on opposite 

 sides of the excavation, advantage being taken of the base-lines set 

 out for the work 5 it is probably due to the dislocation, for the 

 New Red beds seem approximately horizontal in the immediate 

 district. 



There is a sudden change at the top of the green marls, the 

 succeeding beds being stiff black clays 3 the line of junction is 

 hard and w^ell marked, but it is one of erosion, apparently, for the 

 green beds have been cracked and fissured for a few inches, and 

 into these irregular fissures the black sediments have been carried 

 with their fossils (fish scales and teeth) filling up every cranny : 

 there is no mixture however, the limiting outlines are always 

 distinct. There was a complete absence of fossils in the green- 

 mottled micaceous marls, here they become abundant. 



There is no distinct conglomeratic bone bed as at Aust, but 

 some of the usual fish-remains occur immediately with the com- 

 mencement of the dark sediments. No coprolites were seen, but 

 probably would have been found if the search had not been 

 confined to a few little pieces taken out of the vertical sides of the 

 pit. The scales of fish occur too scattered throughout the dark 



