Report on the Moel Tvyfaen Drift. 



123 



Miliolina seminulum (Linn.). Eare. 

 Bulimina pupoides (D'Orb.). Very rare. 

 Bolivina puDctata (D'Orb.). Frequent. 



* ,, plicata (D'Orb.). Common. 



* Cassidulina crassa (D'Orb.). Common. 

 Lagena sulcata (W. & J.). Very rare. 

 , , Williamsoni (Alcock) . Very rare. 

 ,, semilineata (Wright). Very rare. 



* ,, squamosa (Montg.). Very rare. 

 ,, niargiitafa (W. & B.). Rare. 

 ,, quadrata (Will.). Very rare. 



,, clathrata\^x.). Very rare. 

 ,, Orhignyana (Seg.). Very rare. 

 ,, quadricostulafa. (Ess.). Eare. 

 Umgerina anguJina (Will.). Very rare. 

 Globigerina hiiUoides (D'Orb.). Very common. 

 Orbulina iDiiversa (D'Orb.). Frequent, very small. 

 *Discorbina rosacea (D'Orb.). Very rare. 



,, Wrightii (Br.). Common. 



*Pnlvinulina Karstcni (Ess.). Eare. 

 *Nonionina depressula (W. & J.). Most abundant. 

 *Polystomella striato-punctata (F. & M.). Very rare. 



203 specimens of Nonionina depressula were obtained from this gathering, whilst 

 the other twenty-one species numbered only 102. 



No. 4. — Weight of sand, 2 lb. 6-7 oz. troy. After washing, fine 6-6 oz. ; coarse 

 1-3 oz. Sand very dirty, and having a large proportion of stones in it. 

 No Foraminifera. 



Top 





o . "0'-'==^^'' __ 



surface. 



Ye//ow sCo/ie/es^ 

 ^ clay wfth saw/ & 

 ~^i grarel in domes 

 »/iV> ardiafjhtt 

 cross beddf'nj. 

 Slate breeca 

 It" to 6" 



Fig. 7. — Diagram at north-east side of Alexandra Quarry, showing dome-like 



arrangement of sand and gravel beneath Boulder-clay. 



(Length 50 to 60 yards ; height about 60 feet.) 



Note. — Much of the middle series consists of fine plastic reddish- 

 yellow clay or silt without stones, the kind of material common in 

 the stratified drifts of the Isle of Man. Shell fragments rather 

 plentiful in the gravelly streaks, but none seen in the clay or sand. 



p.g. — For the sake of those interested in the drifts of Moel 

 Tryfaen, it may be mentioned that copies of the photographs alluded 

 to in this Keport may be seen in the collection belonging to the 

 British Association (at Jermyn Street Library) ; and of the more 

 important of them also at the Museums of Science and Art in 

 Edinburgh and Dublin. Copies have also been sent to Chicago and 

 Ottawa.— E. G. 



