Correspondence — Rcv. 0. Fisher ; Reversed Faults. 527 
Adelaide chain of metamorphic and slate rocks, where they are 
covered up by a Pliocene drift (of pluvial or glacial origiu), contain- 
ing remains of extinct marsupialia and trees only. 
The two sets of deposits are shown in tlie Well-section alluded to, 
wliicli is as follows : — 
Estimated thicknesses. 
Pliocene — Feet. 
“ Mallee” clay 40 
Miocene (marine). 
Light-coloured sandstone with casts of shells 10 
Gravelly ironstone and bands of clay) 
Blue marl j 
Sandstone without Shells 17 
Loose sand 6 
Actual depth 154 
Uniyersity of Adelaide, 
June 18 th, 1877. Ralph Tate. 
ELEPEAS MEIilDIO KALIS IN DORSET. 
Sir, — At a recent visit to tke Blackmore Museum at Salisbury, 
I was surprised to see two specimens of tke teetk of Elephas 
meridionalis, wkick were labelled as found at Dewlisk, in Dorset- 
skire. Tkis being a preglacial species, it would be interesting to 
learn under wkat conditions tkey occurred at tkat locality, wkich is 
situated among tke Chalk downs. Tke specimens were wkite, and 
kad tke appearance of kaving come out of Ckalk debris. 
The only specimen I kave seen from any Fnglisk locality besides 
tke Cromer Forest-bed was a fragment at tke Chickester Museum, 
said to liare been found on tke neighbouring Sussex coast. 
Can any of your correspondents give information about tkese 
specimens ? 0 . Fisher. 
EEYEESED FAULTS IN BEDDED SLATES. 
Sir, — I skould like to call Mr. Hebert’s attention to a few points 
in bis article on tke above subject in tke October Number, wkick 
appear to require further consideration. Tkough it may be tke 
establisked rule in some coal-mining districts tkat tke kade of a 
fault is to tke downtkrow, tkere are in otker districts exceptions to 
tkis rule, in wkich tke faults are ‘reversed,’ or, as they are commonly 
called kere, overlap faults. The cause of tkese reversed faults is, as 
stated, no doubt horizontal pressure, tke results produced varying 
witk tke angle of kade, friction, and so fortb. Tke causes of tkese 
horizontal pressures I skould be glad to see furtker discussed by the 
author. The cooling of the eartk, and consequent contraction of 
the nucleus beneatk tke solid crust, has, as well as tke more local 
effects of eartkqualces and volcanic intrusions, been suggested as a 
cause. It is evident that a local subsidence under an arcked portion 
of strata will, if tke abutments are stronger tkan tke arch at tke 
line of subsequent rupture (or fault), cause an overlap or reversed 
fault wken tke arck gives way, or it is evident tkat tke matter may 
