30 NEW YORK STATE MUSEUM 



productixc parts of the rei^iun have been the Wheclock and Schooley 

 farms near Jerusalem Hill, thougii here as elsewhere actual out- 

 crops of the waterlime are few. Experience has shown that the 

 exploitation of the fresh rock does not afiford eurypterids in satis- 

 factory preservation, because of its blue-gray character. Exposure 

 not only reduces this to a light gray but aids the fissility of the rock 

 and the broad, flat surfaces of the fossils also help to induce cleav- 

 age planes in the matrix. Exposure of a few years to the weather 

 aids but little. The experiment was made of taking from the out- 

 crop a good many cords of fresh rock which were left exposed for a 

 l)eriod of five years, but the result in the particulars referred to was 

 wholly unsatisfactory. Therefore the supply of these fossils has 

 come from weathered slabs distributed over this region. Miles of 

 stone fences have been inspected and many rods of them taken down 

 and rebuilt. Some of the most productive material has been found 

 in the foundations and cellar walls of buildings and in one instance 

 the foundation wall of a large barn has been removed without dis- 

 turbing the building, the abstracted rock being replaced with con- 

 crete as the work proceeded. Many hands have helped in the acqui- 

 sition of this material : Messrs D. D. Luther, R. Ruedemann, C. A. 

 Hartnagel, Jacob Van Deloo, H. C. Wardell, Fred Braun and the 

 writer, and while it may be difificult at present greatly to enlarge 

 these extensive collections, still they are only an index of the profu- 

 sion of these forms of life in this pool. 



Colony B, or the Buffalo pool, appears to have been quite closely 

 confined to the quarry beds of the Buffalo Cement Company in the 

 northern part of the city of Buffalo. It is from these quarries that 

 has come the majority of the specimens now widespread through the 

 museums of the world. Formerly such specimens were availal)le to 

 any collector, but a few years ago the president of the company de- 

 termined to place all specimens uncovered in the progress of quarry 

 work in the possession of the Buffalo Society of Natural Sciences 

 and by virtue of this laudable act that society possesses in the 

 '' Bennett Collection " a very remarkable array of these remains, 

 which are specially noteworthy for the prevailing large size attained 

 by the individuals. At the present time few Eurypterida are ob- 

 tained from this historic locality and there is reason to believe that 

 the boundaries of the })ool have been approached, though remains 

 of these creatures are found scattered at this geological horizon as 

 far west as Bertie, in Ontario, the locality from which this water- 

 lime formation takes its name. Like the Herkimer pool, that at 

 Buffalo lies in the Bertie waterlime above the salt. 



Colony S, or the Schenectady basin. This recent discovery 

 (TQToVof eurypterids in the Frankfort shale (Lower vSiluric) is 

 comparable to their occurrence at Otisville. These remains, usually 

 in fragmentary condition, abound most freely in fine-grained l)lack 

 shale intercalated between thick calcareous sandstone beds locally 

 known as *' Schenectady bluestone," but they also occur in the sandy 



