Australian Museum Journal Notes on a collection of igneous rocks from Lord Howe Island

Shortform:
David, 1889, Aust. Mus. Mem. 2(6): 127–132
Author(s):
David, T. W. Edgeworth
Year published:
1889
Title:
Notes on a collection of igneous rocks from Lord Howe Island
Serial title:
Australian Museum Memoir
Volume:
2
Issue:
6
Start page:
127
End page:
132
DOI:
10.3853/j.0067-1967.2.1889.484
Language:
English
Date published:
31 December 1889
Cover date:
31 December 1889
ISSN:
0067-1967
CODEN:
AUNMA5
Publisher:
The Australian Museum
Place published:
Sydney, Australia
Subjects:
GEODIVERSITY; LORD HOWE ISLAND
Digitized:
27 March 2009
Available online:
16 July 2009
Reference number:
484
EndNote package:
EndNote file
Title page:
Title page (140kb PDF)
Complete work:
Complete work (1064kb PDF)

Abstract

Introduction. The collection comprises about twenty specimens, collected by Mr. R. Etheridge, junr., and Mr. Alexander Morton.

Classification. Allthe hand specimens examined belong to the basalt group. They appear to belong to three leading types: 1. Basalt with olivine. Theseare chiefly dense dark greenish-gray rocks, for the most part little affected by decomposition, some of them probably being of comparatively recent origin.

2. Basalt without olivine, lateritic. Thisis a lateritic rock, of a dull brick-red colour, soft, earthy and amygdaloidal; passing in places into scoria. This lava may be partly submarine.

3. Basalt, diabasic. A hard dense pyritous rock of a greenish-gray colour and resembling an andesitic dolerite; it has undergone extensive alteration, and is probably of considerable geological antiquity.