174 



MR. A. RKKDLE SHORT OX nU^ErlC 



[May 1904, 



Feet inches. 



1 



9 



Very barren ; a few specimens of 

 Axinus cloacinus and A. concen- 

 tricus. 



Very few organic remains, except 

 coprolites; Acrodus minimus, Saur- 

 ichthys acumuiatus, GyrolcjAs Al- 

 berta. 



(Barren.) 





 



D. Thickly-bedded, fissile, 

 hard, black shales, not 

 crumbly : = ' Paper 

 Shales,' with shaly 

 concretions. 

 C, A. III. Bone-Bed, con- 

 taining Carboniferous- 

 Limestone and sand- 

 stone - pebbles ; very 

 crumbly. 



II. Green and black 



marl. 

 I. Ferruginousband 

 (Keuper). II. Brown sand- 

 stone (variable). 

 I. Hard, sandy. green 

 and brown marl- 

 stone, with den- 

 dritic markings. 



This section is of interest, as showing how ill-developed the Bone- 

 Bed becomes when receding from the old shore ; as it is not coherent, 

 it is not very recognizable. 



The next exposure to be considered is beyond that described 

 second (p. 17*2). Here, in laying a sewer, another interesting 

 succession came to light : — 



1 

 0to5 







and wh ite 

 fine- 



Fet f 



4 











inches. 

 o 



(Fossils as usual.) 



Monotis decussata. 



Modiola minima, Monotis decussata ; 

 Gyrolepis Albcrtii. 



Q, R, S. Blue 



Lias, etc. 

 P. Hard, white, 



grained limestone. 

 O. Hard, thickly-bedded, 



black shale, crumbly on 



its upper surface. 

 N. Gotham Marble, chiefly 3 to 6 



of the variety which I 



have described as "False 



Cotham Marble' (53). 

 M. Blue and yellow 



clay about 2 



Iv, L. Xaiadifa - beds, not 



seen in place. 



Instead of being cream-coloured fissile limestones, these beds are 

 thin, hard, sandy, argillaceous slabs, breaking into thin but large 

 pieces. They are grey in colour, and often sprinkled with tiny 

 mica-flakes. They are, moreover, extensively ripple-marked, the dis- 

 tance between the waves being usually about 2 inches. Exquisitely- 

 preserved worm-tracks, sometimes 13 inches long, are very common. 



Yet another exposure remains to be described, but it is in the 

 Trias rather than the Hhaetic. Still, it throws light on some of the 

 problems of the latter series. It is situated nearer Bristol, about a 



