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Abstract

On my last visit to the Briseis Mine workings, at
Derby, the mining manager, Mr. Lindesay Clark, kindly
guided me over the various alluvial tin-bearing sections
now being sluiced by powerful hydraulic force.
The formation in which the fine alluvial occurs at successive levels consists of white clayey sediments of an
ancient lake-like river-course, generally overlaid by a thick
layer of olivine-basalt.
Among the successive alluvial tin-bearing layers of the
60 to 70 feet of clays, underlying the basalt, lenticular
patches of lignite frequently occur, where, as in the ligneous clays of the auriferous deep-leads of Beaconsfield, they
are associated with fossil leaves, twigs, and fruits, now
regarded by me as of Eocene age, and contemporaneous
with the fossil vegetable remains found abundantly intermixed
with the marine fossils of the Eocene age at Table
Cape.

Item Type:	Article
Authors/Creators:	Johnston, Robert Mackenzie
Keywords:	Royal Society of Tasmania, Van Diemens Land, VDL, Hobart Town, natural sciences, proceedings, records, fossil fruit
Journal or Publication Title:	Papers & Proceedings of the Royal Society of Tasmania
Collections:	Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
Additional Information:	In 1843 the Horticultural and Botanical Society of Van Diemen's Land was founded and became the Royal Society of Van Diemen's Land for Horticulture, Botany, and the Advancement of Science in 1844. In 1855 its name changed to Royal Society of Tasmania for Horticulture, Botany, and the Advancement of Science. In 1911 the name was shortened to Royal Society of Tasmania.
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