Field Geology
Field Geology
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In our eReader you can find the full English version of the book. Read Field Geology Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Field Geology
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Moreover, variations in the intensity of folding, parallel or normal to the main axis, are perfectly characteristic of crustal blocks deformed in one diastrophic period. The only safe criterion for two distinct epochs of folding is found in undoubted cases of angular unconformity in which the younger beds have been folded (Fig. 128). Here the older strata must Fio. 128. — Section of a surface of unconformity between two series of folded strata. The strata below the unconformity have been throug...h two periods of deformation.
Digitized by Google 168 FIELD GEOLOGY have sujffered from deformation twice, once to account for the angle between the two series, and again, whei;i the overiying beds were folded. The determination of successive periods of folding requires widespread geologic investigation and careful correlation of the observed facts.
164. Folds That Originate in Unconsolidated Sediments. — There are several ways in which folds may be produced in beds prior to consolidation. Some such plications fall under the head of contemporaneous deformation (79); others do not.
What to read after Field Geology?
You can find similar books in the "Read Also" column, or choose other free books by Frederic Henry Lahee to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Moreover, variations in the intensity of folding, parallel or normal to the main axis, are perfectly characteristic of crustal blocks deformed in one diastrophic period. The only safe criterion for two distinct epochs of folding is found in undoubted cases of angular unconformity in which the younger beds have been folded (Fig. 128). Here the older strata must Fio. 128. — Section of a surface of unconformity between two series of folded strata. The strata below the unconformity have been throug...h two periods of deformation.
Digitized by Google 168 FIELD GEOLOGY have sujffered from deformation twice, once to account for the angle between the two series, and again, whei;i the overiying beds were folded. The determination of successive periods of folding requires widespread geologic investigation and careful correlation of the observed facts.
164. Folds That Originate in Unconsolidated Sediments. — There are several ways in which folds may be produced in beds prior to consolidation. Some such plications fall under the head of contemporaneous deformation (79); others do not.
What to read after Field Geology?
You can find similar books in the "Read Also" column, or choose other free books by Frederic Henry Lahee to read onlineMoreLess
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