The Levenskulme Limestones. 299 



These (No. 7) limestones have all dark purple fractures, 

 with irregular wavy surfaces, 2 in. deep in the undulations, 

 which are filled in with green shale and limonite. When 

 polished, the surfaces are beautifully bright and veined like 

 a fine "Sienna marble" of a reddish-purple tint, the veinings 

 being yellow and red. Spirorbis spots are dotted all over, 

 and there are curious angular patches of a deeper colour. 

 A thin microscopic slide furnishes a very beautiful subject, 

 being crowded with perfect Entomostraca^ the shells in 

 pairs, and many tubular organisms of the annelida amongst 

 which is the annulated tube of the Ortona Carbonaria. 

 The J^ in. power shows the jointings and the central 

 tube. A shell of Planorbis-W^LQ form is present in this as 

 in several other slides, which is probably the larger form of 

 spirorbis — S. Ambigtms. The lower 9 in. bed has the Ento- 

 mostraca, but not the other items. 



8th Group of Limestones. 



Limestone ... 



2 



ditto 



I 10 



Green marls 



I 



Red marls. Proved 



... 4 



The red marls were not clearly seen on the north side, as 

 the deep cutting stopped abruptly at the last limestone, 

 but the red clays were seen for some 50 yards further east- 

 ward at the base of the boulder clay. The No. 8 Lime- 

 stones are the most massive of all, the two making 3 ft. 

 10 in. thickness, and frequently conjoined. The eastern 

 face of the blocks was much striated by glacial action, the 

 termination of the limestone edge having evidently felt the 

 force of the glacial drift ; large detached masses of the 

 limestone were found in the clay for many hundred yards 

 eastwards. The blocks shewn in our section (Plate V.) are 

 from actual measurements, as also the drag of the coloured 

 marls from the same cause. 



