BRIGHTON ROCKS

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BRIGHTON ROCKS

• Solutions to the newsletter quiz!!!!

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Pahoehoe surface on lava flow.The movement of
still liquid lava below the surface of a cooling
flow caused the solid surface to ripple.
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(B) Crystals of sulphur lining a fumarole (gas
vent).
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(C) Fossil echinoderm (sea urchin) from the Chalk.
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(D) A metasedimentary xenolith in the St. Davids
Head gabbro. The gabbro magma ripped up
fragments of the surrounding rock and included
them in the intrusion.
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(E) Accretionary lapilli in jointed tuff, Lake
District.Blobs of lava thrown out by a volcanic
eruption had layers of dust stuck to them as the
flew through the air.
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(F) Rain splash marks and trace fossils
(fossilised burrows and animal tracks) in
Mudstone.Marks like this give key indicators of
depositional environments.
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(G) Halite (rock salt) crystals. These crystals
actually grew in a pool of water on the floor of
a salt mine.
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(H) Epidosites from Cyprus.The pale green
stripes are bands of epidote-quartz rock, formed
from the surrounding dolerite by the action of
seaflorr hydrothermal solutions.