400 Prof. T. G. Bonney—Tlic Chalk Bluff at Tvimhujham. 



(xxvii) In a disused quarry about 600 yards further north 

 (lat. o3° S' 0" N., long. 3° 10' 52" W.) the limestones and shales 

 are remarkably fossiliferous, and yielded the following list: — 



Amplexi-zaphrent'xs <p, Viiug-hau MS. F. lougispinus, Sow. 



Cdinpopliyllum aff. Murchisoni, E. & H. F. pKstufosits, Phill. 



Ci/iith(i.ruiiiu (?) sp. itSchiziip/iuriu resupiuata (Mart.), 



DmsipliyUiiin sp. Stminida ainbigua (Sow.). 



Dihiinophyllum sp. Spirifer bisulcalus. Sow. (Very abundaut.) 



Cyclophyllitm pachyendothecum, Thomp. S. cf. triangularis (Mart.). (Very 



Athyris plauosulcatKS, Phill. abundant.) 



Chonctfs Lagnessinna, Do Kon. S. trigoiinlis (Mart.), D'Orb. (Very 



C. papUioDacea, Phill. abundant.) 



Frodiicius giyanteus (Mart.). 



(To be continued in our next Number.) 



II. — TnK Chalk Bluff at Tkimingiiam. 

 By Professor T. G. Bonney, D.Sc, LL.D., F.R.S. 

 (With two Text-tigures.) 



MR. R. M. BRYDONE'S account of the masses of chalk exposed 

 on the Norfolk coast near Trimingham,' pul)lished in this 

 Magazine during the tirst three months of the present year, is 

 a valuable record of facts revealed by the encroachments of the sea, 

 but it raises questions of a general nature, on which I should at 

 once have commented, had 1 not preferred to wait until I could 

 again examine the sections. Tliis was done in company with the 

 Rev. E. Hill during Easter week, when we found that even since 

 the middle of last October (the date of Blr. Brydone's latest photo- 

 graph) the destruction had been considerable.' 



The isolation of the more notable bluffs is now complete. Though 

 a memorial of defeat, it rises from the shore like a Roman arch of 

 triumph (Fig. 2), one pier of which is formed of chalk, the other of 

 boulder-clay (the so-called Cromer ' till '), while the outlines of the 

 second and third masses* have been modified, as indicated iu the 

 sketch-plan (Fig. 1). 



As I have not found Mr. Brydone's paper very easy to follow, 

 owing to its being vsomewliat discursive and crowded with minute 

 palasontological details, the time of readers may be saved by l)riffly 

 enumerating the points to which 1 take exception. These paUeontu- 

 logical details I abstain from discussing because I think ilmt even 



' I have followed the spelling of the Survey Memoir and my copy of the Ordnance 

 Map. 



- It may facilitate references to mention that in our paper Ave refer to the chalk 

 masses as eastern and western (another nistance of inattention to the minutiiv of the 

 literature of the subjcot.) whore Mr. Brydone and some earlier writers use southern 

 and nortliern. Herein we followed our notes ; for the trend of the coivst is more 

 nearly in the former direction. From Weymouth to Sheringham it is nearly west 

 and east. From the latter place it runs about E. 10° S., beginning at Cromer to 

 ])oiut rather more to the south, and for some distance on either side of the ' bluff ' its 

 general direction is from 30° to 35° S. of E., not running quite S.E. even beyond 

 Mundesley. 



•* That marked A in the illustration accompanying our paper (Plate XXII) iu the 

 September number of this ^Magazine, IDOo. 



* C and E ol the same Plate. 



