noun Geology.
a line drawn on a map connecting all points of equal thickness of a particular geologic formation.

1915–20; iso- + -pach < Greek páchos thickness Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
isopach or isopachyte (ˈaɪsəʊˌpæk, ˌaɪsəʊˈpækaɪt)
geology a line on a map connecting points below which a particular rock stratum has the same thickness
[C20: from iso- + Greek pakhus thick, pakhutēs thickness]
isopachyte or isopachyte
[C20: from iso- + Greek pakhus thick, pakhutēs thickness]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The isopach interval includes all but the uppermost part of the stratigraphic sequence studied during the present investigation.
The oil well and surface data were likewise computer contoured to produce an isopach map of the formation.
Structure and isopach maps and cross sections were prepared.
Isopach maps were also generated to represent the different sediment packages overlying the limestone.
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