272 Dr. O. S. Du Riche Preller—The Tuscan Archipelago. 
The Globigerina Limestone might be an indurated chalk of 
Barbadian type, but it can also be compared with the Globigerina 
marls recently described by Mr. Lechmere Guppy,’ and its associa- 
tion with a rock containing shallow-water forms, such as Amphiste- 
gina and Nummulites is a fact which specially recalls the San Fernando 
section, where a certain band of limestone is said to consist chiefly of 
Amphistegina and Nummulites, Rotularia clymenioides and Nullipores.” 
The San Fernando beds are considered to be of Hocene age by 
Mr. Guppy, and if Eocene is used in its older Lyellian sense as 
including all that is older than Miocene, he may be right; but the 
classification of the Tertiary deposits of the West Indies is at present 
in a very unsatisfactory state. It is at any rate interesting to find 
in this small patch of limestone on Canouan what seems to be 
evidence of the northerly extension of the sea in which the Fora- 
miniferal deposits of Trinidad were accumulated. 
IX.—Norte on tue Tuscan ARCHIPELAGO. 
By C. 8. Du Ricuz Pretuzr, M.A., Ph.D., M.I.E.H., A.M.I.C.E., 
F.C.S., F.G.S. 
N the course of a recent prolonged residence in Tuscany and the 
Carrara Marble District, I had occasion to become well-acquainted 
with the Maremma hills and the islands composing the Tuscan 
Archipelago; and as I propose to revisit those islands at an early 
date with a view to more closely examine certain phenomena relating 
to the eruptive and metamorphic series more especially of Hlba, it 
may not be out of place if, in the meantime, I give a rapid pre- 
liminary sketch of the leading geological and petrological features 
of that archipelago as a whole. 
As is well-known, the exceedingly interesting but also ex- 
tremely complex phenomena which are met with more especially 
in Elba have, apart from the mineral wealth of that island, for 
many years attracted the attention not only of Italian, but also of 
other geologists such as Vom Rath, Rayer, Dalmer, Nessig, and 
others. In not a few cases, however, the more or less cursory 
inspection on the spot by some, and the one-sided microscopical 
examination of a few isolated and hence not representative specimens 
by others, have led to a variety of conflicting and not infrequently 
erroneous views. The recent survey of the island, made on behalf 
of the Italian Government by Signor Lotti and his coadjutors, is 
therefore the more welcome, as at any rate a modern and adequate 
geological map of that classic locality is now available as a basis and 
starting-point for further research. 
It need hardly be pointed out that the Tuscan Archipelago not only 
constitutes the connecting link between the mainland of the Italian 
peninsula and Corsica and Sardinia, but also forms part of the chain 
of islands which fringe the whole length of the peninsula as far as 
Sicily, and whose eruptive phenomena in more ancient as well as in 
1 Quart. Journ. Geol. Soc. vol. xlvii. p. 519. 
2 Op. cit. p. 523. 
