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.

 
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Bibliographic Data

Short Form
David, 1889, Aust. Mus. Mem. 2(6): 127–132
Author
T. W. Edgeworth David
Year
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
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Title Page
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