Guide to the Collections of Rock And Fossils Belonging to the Geological Survey
Guide to the Collections of Rock And Fossils Belonging to the Geological Survey
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A great dyke at Rostrevor is much worked for paving-setts ; it is an uralitic diabase or epidiorite containing plagioclase, augite, uralite, viridite, and magnetite (1765). Pro- fessor von Lasaulx termed the rock eucrite.
CASE F. THE OLDER IGNEOUS ROCKS OF ANTRIM.
(Map F; Sec. 2. ) A beautiful diorite of the type called camp- tonite by Rosenbusch occurs at Rue Bane Point, in Antrim, amongst the gneisses and schists. It contains crystalline hornblende and biotite in a decomposed felspathic base,... which now includes much calcite and minute needles of hornblende (1896, 2825). Ejndiorites also occur here (2347). A mass of quartz-jelsite or quartz- porphyry (2836, 2351, 2) occurs to the west of Cushendall, and has provided by denudation a large proportion of the pebbles of the conglomerates at the base of the Old Red Sandstone of that locality (2834). It is a porphyritic rock, red, white, or black in colour, with abundant crystals of porphyritic orthoclase and some plagioclase, brown mica and quartz, in a close-grained ground- 78 ULSTER.
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To quickly assess the difficulty of the text, read a short excerpt:
A great dyke at Rostrevor is much worked for paving-setts ; it is an uralitic diabase or epidiorite containing plagioclase, augite, uralite, viridite, and magnetite (1765). Pro- fessor von Lasaulx termed the rock eucrite.
CASE F. THE OLDER IGNEOUS ROCKS OF ANTRIM.
(Map F; Sec. 2. ) A beautiful diorite of the type called camp- tonite by Rosenbusch occurs at Rue Bane Point, in Antrim, amongst the gneisses and schists. It contains crystalline hornblende and biotite in a decomposed felspathic base,... which now includes much calcite and minute needles of hornblende (1896, 2825). Ejndiorites also occur here (2347). A mass of quartz-jelsite or quartz- porphyry (2836, 2351, 2) occurs to the west of Cushendall, and has provided by denudation a large proportion of the pebbles of the conglomerates at the base of the Old Red Sandstone of that locality (2834). It is a porphyritic rock, red, white, or black in colour, with abundant crystals of porphyritic orthoclase and some plagioclase, brown mica and quartz, in a close-grained ground- 78 ULSTER.
What to read after Guide to the Collections of Rock And Fossils Belonging to the Geological Survey?
You can find similar books in the "Read Also" column, or choose other free books by Dublin Science And Art Museum to read onlineMoreLess
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