BUFFALO SOCIETY OF NATURAL SCIENCES 1 29 



unexpected as the fauna in the Shawangunk conglomerate. It is 

 also not improbable that some of the tracks reported from the Hawick 

 rocks were made by eurypterids, an interpretation in keeping with 

 Patten's suggestion for the origin of Climatichnites (Patten, 206). 



Following the retreatal phase of the Llandovery and the succeeding 

 terrestrial phase of the Tarannon are the Wenlock beds. Though 

 now exposed only in the southern belt below the tableland, in the 

 small inliers in the Pentland Hills and Lanarkshire, and in the Girvan 

 area, there is little doubt that the Wenlock at the time of its deposi- 

 tion extended entirely across this area. Such being the case, it repre- 

 sents the deposits of the advancing Wenlock sea. Continuous sec- 

 tions from the Tarannon into the Wenlock at various places in the 

 belt south of the tableland show that the succession is conformable, 

 thus proving that the line marking the end of the retreat of the sea 

 must be northwest of this band and would lie, therefore, in the region 

 of the tableland from which all Wenlock strata have, unfortunately, 

 been removed. It is probable that the Tarannon-Wenlock shoreline 

 was in the central or southern portion of the central belt. One of the 

 finest exposures of the conformable contact of the Wenlock on the 

 Tarannon is at Burrow Head, the outermost extremity of land be- 

 tween Luce and Wigtown bays just north of Solway Firth. The 

 nature of the sediments along the belt south of the tableland indicates 

 that oscillatory conditions prevailed, the seafloor being covered at 

 times with fine muds, at others by coarse conglomerates. One would 

 have expected that terrigenous deposits would have played a less 

 important part there than in the Pentland Hills which are known to 

 have been nearer the old shoreline. It is not unlikely that the land 

 may have projected southward in a peninsula which lay between the 

 present sites of Lanarkshire and Girvan, thus bringing the terrig- 

 enous sediments further south. In the southern belt there has been 

 recorded a single occurrence of a eurypterid remain, so incomplete 

 and so poorly preserved that it is specifically unidentifiable. Four 

 miles south of Hawick at the junction of a small tributary with the 

 Slitrig water Eurypterus sp. is reported associated with Ceratiocaris 

 papilio and a number of graptolites. This type of occurrence, namely 

 of a single eurypterid fragment associated with well-preserved abun- 

 dant remains of marine organisms, has already been mentioned several 

 times, and its significance pointed out. A general summary will be 

 found below on page 194, in which the argument for the marine 

 habitat of the eurypterids based upon such evidence is dealt with 

 and, I trust, demolished for all time. 



