Abstracts of Papers read on Geology. ' 519 



These fossils were discovered in May, 1911, when Mr. C. H. 

 Cunnington and I were mapping the Triassic rocks bordering the 

 eastern side of the coal-field. I suggested to my colleague that if 

 fossils could be found anywhere in the Bunter they would most likely 

 be discovered in the thin marl-bands occasionally interbedded in the 

 predominant sandstones and conglomerates ; and Mr. Cunnington's 

 hammer was the first to reveal the specimens. 



We obtained them from two thin bands of red marl in a disused 

 sand-quarry at Ogley Hay, 5 miles north-east of Walsall. The 

 quarry forms a conspicuous excavation in the northern face of 

 a sandstone hill, along the foot of which passes the Anglesey branch, 

 of the Wyrley and Essington Canal. The hamlet of New Town, on 

 the Watling Street, lies 150 yards to the north of the quarry, while 

 Ogley Hay Chemical Works stands 200 yards away to the south-east. 

 Below a little drift gravel are exposed 22 feet of dull-red medium- 

 grained soft sand-rock, in places false-bedded. Toward the bottom 

 are two bands of red marl, about 1 ft. 8 in. apart, the lower one 

 being about 2 feet above the bottom. They nowhere exceed 9 inches 

 in thickness. Both marl-bands yielded poorly preserved remains, 

 determined by Mr. H. A. Allen as Estheria cf. minuta (Alberti). 



The ground is coloured on the old series 1 inch map (62 N.E.) as 

 Upper Bunter (f^) ; but the sandstones are coarser and duller in colour 

 than the typical Upper Bunter of other Midland districts, and would 

 more suitably be included in the outcrop of the Pebble Beds (f^). The 

 Triassic series dips at 3° to 5° toward E.N.E., in which direction the 

 Pebble Bed subdivision appears to pass laterally into, and partly 

 beneath, finer-grained and brighter-coloured sandstones that may be 

 regarded as Upper Bunter. Above these follows the Lower Keuper 

 Sandstone (f*). There is thus no question as to the beds in the quarry 

 being Bunter, and every ground for referring them to the Pebble Bed 

 subdivision. 



4. The Relation of the E,hiwlas and Bala Limestones at Bala, 

 jS". Wales. By Dr. Gertrude L. Elles. 



THE difficulties in the interpretation of the succession in the Bala 

 district appear to be due largely to the impersistent nature of 

 the limestones and their inconstancy as to horizon. 

 The succession is as follows : — 



(Hirnant Limestone (impersistent). 

 Hirnant Flags and Mudstones. 

 Ehiwlas Limestone (impersistent) . 

 /•Bala Limestone (impersistent). 

 Calcareous Ash. 

 Mudstones. 

 Coarse Ash. 



Mudstones and flags with thin impersistent Limestones. 

 Ash. 



Sandy flags, with occasional impersistent Limestones. 

 Ash. 

 Sandy flags becoming shaly towards base. 



The Rhiwlas Limestone is an impersistent limestone at the base of 

 the Hirnant Series, and is found only in the northern part of the 



Bala Limestone 

 Series 



