FREE BOOKS

Author's List




PREV.   NEXT  
|<   365   366   367   368   369   370   371   372   373   374   375   376   377   378   379   380   381   382   383   384   385   386   387   388   389  
390   391   392   393   394   395   396   397   398   399   400   401   402   403   404   405   406   407   >>  
tones of the west and north-west of New Holland are so like those of the west of England, and of Wales, that the specimens from the two countries can scarcely be distinguished from each other; the arenaceous cement in the calcareous breccia of the west coast is precisely the same with that of Sicily; and the jasper, chalcedony, and green quartz approaching to heliotrope, from the entrance of Prince Regent's River, resemble those of the Tyrol, both in their characters and association. The Epidote of Port Warrender and Careening Bay, affords an additional proof of the general distribution of that mineral; which, though perhaps it may not constitute large masses, seems to be of more frequent occurrence as a component of rocks than has hitherto been supposed.* The mineral itself, both crystallized and compact, the latter in the form of veins traversing sienitic rocks, occurs, in Mr. Greenough's cabinet alone, from Malvern, North Wales, Ireland, France, and Upper Saxony. Mr. Koenig has found it extensively in the sienitic tract of Jersey;** where blocks of a pudding-stone, bearing some resemblance to the green breccia of Egypt, were found to be composed of compact epidote, including very large pebbles of a porphyritic rock, which itself contains a considerable proportion of this substance. And Mr. Greenough has recently received, among specimens sent home by Mr. J. Burton, junior, a mass of compact epidote, with quartz and felspar, from Dokhan, in the desert between the Red Sea and the Nile. When New Holland is added to these localities, it will appear that few minerals are more widely diffused. (*Footnote. See Cleaveland's Mineralogy 1816 page 297 to 300.) (**Footnote. Plee's Account of Jersey quarto Southampton 1817 page 231 to 276.) 3. The unpublished sketches, by Captain King and Mr. Roe, of the hills in sight during the progress of the survey of the Coasts of Australia, accord in a very striking manner with the geological character of the shore. Those from the east coast, where the rocks are primitive, representing strongly marked and irregular outlines of lofty mountains, and frequently, in the nearer ground, masses of strata highly inclined. The outlines on the contrary, on the north, north-west, and western shores, are most commonly uniform, rectilinear, the summits flat, and diversified only by occasional detached and conical peaks, none of which are very lofty. 4. No information has yet been obtained, from
PREV.   NEXT  
|<   365   366   367   368   369   370   371   372   373   374   375   376   377   378   379   380   381   382   383   384   385   386   387   388   389  
390   391   392   393   394   395   396   397   398   399   400   401   402   403   404   405   406   407   >>  



Top keywords:

compact

 

mineral

 
outlines
 

quartz

 

sienitic

 

Footnote

 

Greenough

 

Jersey

 

breccia

 

Holland


specimens

 
epidote
 
masses
 

Account

 
quarto
 
Southampton
 

unpublished

 

sketches

 

desert

 

Dokhan


Burton

 

junior

 

felspar

 

diffused

 

Cleaveland

 

Mineralogy

 

widely

 

minerals

 

localities

 
Captain

manner

 

commonly

 
uniform
 

rectilinear

 

summits

 
shores
 

western

 
strata
 

highly

 
inclined

contrary

 

diversified

 

information

 
obtained
 

occasional

 

detached

 
conical
 

ground

 

nearer

 
Australia