Glossary of Speleological and Caving Terms
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Copyright © Australian Speleological Federation Inc. 2002

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OBLIGATE Invariably. A species which is unable to live outside of a given environment. Applied to animals living in the dark zone of caves that may display Troglomorphic adaptions.
Biology - Flora & Fauna. Ref AC
ON BELAY Signal given to a climber by the belayer, that the manually operated belay system is ready for use.
Climbing and SRT. Ref MM
OOLITE Oolitic limestone. A type of rock, often calcareous which grows by radial or concentric means around a nucleus. The term Oolite formerly referred to cave pearls.
Karst - Kinds of. Ref JJ
OPEN TRAVERSE A survey traverse which does not form a loop.
Survey & Mapping term. Ref JJ
ORDER 4th rank in Taxonomic system. Kingdom, Phylum, Class, Order, Family, Genus, Species.
Biology - Flora & Fauna. Ref MM
ORGANIC Of biological origin. (Strictly includes all carbon compounds, some of which are NOT biological).
Biology - Flora & Fauna. Ref AC
ORIENTATION The relationship of a survey line to true, grid or magnetic north.
Survey & Mapping term. Ref JJ
OROGEN Oro = mountain. A belt of deformed rocks, making up a portion of the continental crust.
Geology. Ref MM
OUTFLOW CAVE A cave from which a stream flows or formerly did, and which can not be followed upstream to the surface.
Cave - Kinds of. Ref JJ
OVERHANG A simple cave or rock shelter in which no part is in the dark zone.
Cave - Kinds of. Ref MM
OVERHANG A ladder or rope that hangs over a ledge or shelf of rock that projects past the rest of the rock face below, & thereby hangs free.
Climbing and SRT. Ref MM

Copyright © Australian Speleological Federation Inc. 2002

The Glossary of Speleological and Caving Terms is the copyright property of the
AUSTRALIAN SPELEOLOGICAL FEDERATION INC. (ASF) and any reproduction of it either in part or in full, should have the approval of the ASF, and such reproduction should be accompanied by a copyright notice similar to this one.

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