0HI71R5IT71 
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INTRODUCTION. 
This Catalogue of Yorkshire Jurassic Fossils was originally com- 
piled, on a smaller scale, to facilitate the work of the Geological 
Survey of the no^rth- eastern part of this county. 
During this work it was of such frequent service, in estimating the range 
of different species, in tracing the origin of these determinations, and 
thus concisely pointing out what had been done by other authors in this 
field of inquiry, that it occurred to me it might also be of some utility to 
students of this district, until we get the more complete work of 
Mr. Etheridge, so long promised, and for which all geologists have been 
so anxiously looking forward. With this object it is offered as an 
appendix to the present monograph. 
The Catalogue naturally depends very largely upon the works of 
Messrs. R. Tate and J. F. Blake for the Lias, and Messrs. Blake and 
W. H. Hudleston for the Oolites; as well as the monographs of the 
Palseontographical Society, all of which contain much valuable informa- 
tion on the Palaeontology of these rocks. I have received much assist- 
ance from many friends, more particularly from Dr. G. J. Hinde, 
Mr. James Carter, Mr. J. F. "Walker for the respective classes in which 
the researches of these authors are so well known. I am also much 
indebted to Dr. Henry Woodward, Mr. R. Etheridge, Mr. H. M. 
Platnauer, Mr. S. Chad wick, Mr. G. W. Lamplugh, and others for many 
facilities afforded; and especially to my colleagues Mr. C. Reid, for the 
revision of the list of Plants, and Messrs. G. Sharman and E. T. Newton 
for much information and general supervision of the work. 
The general scheme of the Catalogue is to give in the first column the 
original reference to each species, with a few other references to more 
easily accessible works or to better figures, followed by some of the 
synonyms of the species, but more particularly those which have been 
applied to Yorkshire specimens. 
The narrow columns give the range of the species, with the initial of 
the author who has recorded it from that horizon and locality ; with the 
exception of the columns marked " pass up " and " pass down,"* where 
the initials are those of the formation to which the species pass in either 
direction. 
The small figures under the initials indicate the region from \rhich 
the record is made, thus : 
1. Eefers to species found on the coast. 
2. Along the northern escarpment and Cleveland. 
3. The western escarpment (including the western end of the Howardian 
Hills). 
4. The interior of the district. 
5. The Howardian Hills. 
6. South Yorkshire. 
7. Generally present in most districts. 
* The term " pass down " is rather objectionable, but of course it really implies 
that the species have been recorded from older formations. 
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