Example Sentences

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These are mostly unmetamorphosed clastic rocks deposited in rivers and lakes during the middle Proterozoic, at around 1,400 Ma, while Laurentia was still part of the supercontinent Columbia.

From Textbooks • Jan. 1, 2015

Explain why the ancient sedimentary rocks of the Athabasca and Thelon Basins are generally unmetamorphosed and undeformed.

From Textbooks • Jan. 1, 2015

The upper body, which has intruded into cool unmetamorphosed rock, has created a zone of contact metamorphism.

From Textbooks • Jan. 1, 2015

The thick strata of unmetamorphosed Paleozoic rocks indicate that such high temperatures have not prevailed at such slight depths since the Proterozoic.

From Climatic Changes Their Nature and Causes by Huntington, Ellsworth

Whence it follows, that sedimentary strata passing a certain antiquity, are unlikely to be found in an unmetamorphosed state; and that strata much earlier than these are certain to have been melted up.

From Essays: Scientific, Political, & Speculative, Vol. I by Spencer, Herbert