Biogenic
Article Index for
Biogenic
Website Links For
Substance
Information About
Biogenic
CATEGORIES ABOUT BIOGENIC SUBSTANCE
geological processes
natural materials
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Plant
s or
Animal
s.
Examples
Coal
and
Oil
are examples of constituents which have undergone changes over
Geologic Time
periods.
Chalk
, and
Limestone
are examples of secretions (marine
Animal Shell
s) which are of geologic age.
Cotton
and
Wood
are biogenic constituents of contemporary origin.
Pearls
,
Silk
and
Ambergris
are examples of secretions of contemporary origin.
