THE KHAETIC BONE BEDS 
225 
of the shoal, and the tliickness by the time it remained at 
that station. 
5. At intervals the shoal shifted to another station, 
where the process was repeated, and another Bone Bed 
formed. 
6. Owing to deposition of sediment, each successive 
bed was on a higher horizon than its predecessors. 
7. These bone sheets are original deposits in situ, and 
not drifted material. 
8. They may be summed up as submarine guano beds 
laid down by the floating population of the period. 
In conclusion, while not being so sanguine as to expect 
that these views will And immediate acceptance (as old 
ideas are hard to eradicate), the writer firmly believes that 
any geologist who will clear his mind of antiquated tra- 
ditions and preconceived notions, who will refer to the 
Bone Beds themselves, and carefully and fairly read the 
evidence contained therein, will not be able to avoid 
coming to conclusions similar to those brought forward 
in this paper. 
The author tenders his thanks to the writers of the 
appended letters, and also to the following for information 
and assistance in various matters : Drs. A. Smith Woodward, 
C. W. Andrews, and A. Vaughan, Professors C. Lloyd 
Morgan and S. H. Reynolds, Messrs. H. B. Woodward, 
C. D. Sherborn, L. Richardson, F. M. Burton, W. 
Jerome Harrison, and W. S. Moxley). 
APPENDIX. 
The following are extracts from letters received by the 
author with regard to the occurrence of pebbles in fish’s 
stomachs : — 
