BUFFALO SOCIETY OF NATURAL SCIENCES 1 65 



Eurypterus sp. 

 Plerygotus bilobus ? (Salt.) 

 Lanarkia horrida (Traq.) 

 L. spinosa (Traq.) 

 L. spinulosa (Traq.) 

 Slimonia acuminata (Salt.) 

 Stylonurus sp. 

 Thelodus scoticus Traq. 

 Ateleaspis tessellata (Traq.) 

 Ceratiocaris sp. 

 Birkenia elegans (Traq.) 

 Lasanius problematicus (Traq.) 

 Plants 

 Sponge 



2. The Anticline of the Hagshaw Hills. About five miles to the 

 south of the Lesmahagow anticline rises the crest of the Hagshaw 

 Hills anticline, the axis trending northeast southwest. The area 

 between the two anticlines is occupied by a northern belt of lime- 

 stone, Mississippi in age (Calciferous limestone of Scottish geolo- 

 gists), and by a southern area of Lower Old Red sandstone with one 

 patch of Upper Old Red. Rising above these is the anticline forming 

 the Hagshaw Hills, where the Wenlock, Ludlow and Downtonian 

 are exposed by erosion. It is only in the northern limb of the anti- 

 cline that the Wenlock and Ludlow are visible, for the southern has 

 been cut off by a thrust fault along the plane of which the older 

 Siluric rocks have been brought to rest against the younger ones. 

 The Douglas Water and its many small tributaries have exposed a 

 number of good sections in the western area of the anticline. One of 

 the best of these is in the Ree Burn, south of the Glenbuck Reservoir 

 where there is an almost continuous section of the Ludlow rocks. 

 At one point in certain blue finely bedded shales and flaggy grey- 

 wackes specimens of Ceratiocaris, Slimonia and Beyrichia kloedeni, 

 have been found. Along the southeastern slope of the anticline 

 where the Podowrin Burn joins the Douglas Water near Monksfoot 

 a transverse section of the Ludlow rocks is shown. They are grey- 

 wackes and flaggy shales and are thought to be the equivalent 

 of the lowest Ludlow in the Lesmahagow area. It has not been 

 possible to obtain any definite statement as to the exact horizons 

 in which the fossils occur and whether the eurypterids occur as they 



