212 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Mai*. 24, 



ft. in. 



1. 



3 long by 5 wide. 



2. 



4 6 , 



> H „ 



3. 



4 , 



4 



> 



4. 



5 3* , 



5 



» 



5. 



3 8 , 



> 4^ 



> 



6. 



5 5f , 



> 5^ 



i 



7. 



11 8 , 



. 5f 



J 



8. 



12 , 



' 5f 



>> 



9. 



12 



, 6 



J 



10. 



18 , 



> 5f . 



, 



11. 



10 , 



6 



J 



12. 



18 OX , 



, 6i , 



} 



(No. 2 of Prof Owen's description.) 



(No. 3 of Prof. Owen's description.) 



107 6 



The remaining five, numbered 13 to 17, are upon a ripple-marked 

 surface, the ridges of the ripples running in the direction N. 71° E., 

 and this surface is 2 inches below the smooth one. The measure- 



ments are — 





ft. in. in. 





13. 



14 6 long by 6 wide 





14. 



3 3 „ 





15. 



15 3 „ 4i „ 





16. 



20 4 „ 4 „ 





17. 



8 3 „ , 5 „ 



61 7 



PI. VIII. C. shows six tracks, which are represented by coloured 

 lines without numbers. One of them is very narrow, not exceeding 

 three-quarters of an inch in breadth. Their measurements are — 



ft. in. 



in. 



9 6 long by 



4^ wide. 



3 „ 



^"2 i> 



3 6 „ 



51 „ 



1 „ 



5i „ 



1 „ 



Of „ 



18 



The tracks are upon a smooth surface (marked 5), which, like the 

 other smooth surfaces, has been rubbed by the ice. On the same 

 surface there is ripple-mark, the natural edge or termination of which 

 is seen, and by it the tracks are obliterated. Three of them come up 

 to the edge of the ripple, and are not traceable upon it. From the 

 general line of the edge a part projects, like a spur or triangle, which 

 is marked across by the ripple up to the apex, as if the cause pro- 

 ducing the ripple had reached that far and no farther. The part 

 lettered d also shows ripple-marks, and is 6 inches higher than the 

 surface marked c, which runs on below it, and while the direction of 

 the ripple-lines on c? is S. 53° E, those on c run S. 80° E. On the 



* Rather less of this track appears in the plan than on the plaster-casts. 

 t In the plan this track extends further than on the plaster-casts. 

 J A portion of this track, to the extent of 87 feet, on the sandstone slab, is 

 temporarily placed in the Society's Museum by Mr. Logan. 



\.. 



