WordNet
n. (geology) the geological features of the earth [syn: formation]
Wikipedia
A formation or geological formation is the fundamental unit of lithostratigraphy. A formation consists of a certain number of rock strata that have a comparable lithology, facies or other similar properties. Formations are not defined on the thickness of the rock strata they consist of and the thickness of different formations can therefore vary widely.
The concept of formally defined layers or strata is central to the geologic discipline of stratigraphy. Formations can be divided into members and are themselves frequently parcelled together in groups.
Usage examples of "geological formation".
If it has been a battle-field, that was because it combined certain conditions of geographical position, of geological formation, drawbacks even, of a kind that would obstruct the enemy ( a river, for instance, cutting his force in two), which made it a good field of battle.
Let me see the new mountain from above, the greatest geological formation in a hundred thousand years.
An examination of the geological formation of our Atlantic States proves beyond a doubt, from the manner in which the sedimentary rocks, the sand, gravel, and mud--aggregating a thickness of 45,000 feet--are deposited, that they came from the north and east.
A flood that lasted only 40 days could never have produced that kind of geological formation.
The geological formation looked like a white mirrored oval, marking the boundaries of what had once been an open sea thousands of years ago.
No doubt about it, this peculiar structure with its blurry outlines could not be mistaken for any geological formation.
I perdict frum ther geological formation o' this nest an' a dream I hed last night, thet thar's sum uv ther biggest veins right in this yere valley as ye'll find in ther Hills!