THE 



GEOLOGICAL MAGAZINE. 



NEW SERIES. DECADE V. VOL. VIII. 

 No. IX. — SEPTEMBER, 1911. 



ORIGINAL ARTICLES. 



I. — Some Notes on the Geology of the Bermuda Islands. 



By E. Ashington Bullen, B.A. (Lond.), F.L.S., F.G.S. 



(PLATES XVIII-XX. 1 ) 



I. Geneeal Introduction. 



A. E. Verrill. A. Agassiz. Nelson. Wyville Thomson. 

 Vulcanological Substratum. Rev. Osmond Fisher, F.G.S. 

 Evidence, (a) Charting, (b) Magnetic Deflection, (c) Analogy. 

 II. The Prevailing Winds. Evidence. Result. 



III. The Principal Geological Formations. 



(1) The Walsingham Formation. General Character. Extinct 



Endemic Land Mollusca. Their Fossil Condition. Abundance 

 at a Quarry near Harrington House. Rainfall. Caves. Red 

 Soil, its Source and Composition. 



(2) Devonshire Formation. Proofs of Subsidence and Re-elevation. 



Nelson and Verrill. A. Agassiz. 



(3) Paget Formation. Fossil Birds' Eggs. Turtle. 



(4) Recent iEolian Sands. Their Composition. Sand Invasion at 



Elbow (Middleton) Bay, etc. Plants that Consolidate the Sands. 

 Absence of Coral in the Sands. 



IV. ' Serpuline Atolls' or 'Boilers'. Nelson and Agassiz thereon. 



Recent Serpulas on Walsingham Formation. 

 V. FORAMINIFERA; Mr. Richard Holland's Report. 

 VI. Some Recent Evidence of Submergence. 



(1) Phosphorite Rock from St. George's, Manhattan Shoal, Walsingham 



Formation. Mr. Russell F. Gwinnell's Report. 



(2) The Crystal Cave, Walsingham Formation. 



VII. A Puzzling Grey Rock from about 75 feet O.D. Mr. Russell 



F. Gwinnell's Report thereon. 

 VIII. Some instructive Photographs. 



(1) The Carving Out of Pinnacles, St. George's and Bailey Bay, 



in Paget Formation. 



(2) Formation of ' Pot-holes ', St. David's Head, Walsingham 



Formation. 



(3) 'Pseudo-palmetto Stumps,' Hungry Bay, Walsingham Formation. 



(4) Soft Limestone Rock overlain and underlain by indurated, 



reticulated Limestone, west of Hungry Bay, Paget Formation. 



I. General Introduction. 



TITHE geology of the Bermuda group of islands has been so 

 JL exhaustively treated by Professor Verrill, Dr. Alexander 

 Agassiz, and Lieutenant (afterwards General) Nelson (in what will 

 always be the classic memoir on the subject) that it may seem pre- 

 sumptuous for another description to appear. However, as there are 



1 Plates XXI-III will appear in October with Part II of text. 

 decade v. — VOL. viii. — NO. ix. 25 



