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The AAPG/Datapages Combined Publications Database
AAPG Special Volumes
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Peat diapirs 3-4 ft high are found in Recent sediments of the Flevoland, The Netherlands. The peat (Lower Peat) was deposited approximately 7,000 years ago on an eroded Pleistocene surface. The 4 to 6 ft of sediments which overlies the peat includes, from oldest to youngest, Unio Clay, Cardium Clay, Young Peat, and Almere and Zuiderzee deposits. Small-scale diapiric folds and related structures, similar to the larger Gulf Coast structures, are present in the Recent deposits on the flanks of several elongate Pleistocene sand ridges. The structures most like those of the Gulf Coast are down-to-the-basin normal faults, rim synclines, and, in one place, a central graben. The diapiric folds are found where the dip of the onlapping Recent sediments increases a ong the flanks of the sand ridges. The folds probably resulted from peat flowage down the ridge slopes. The time of diapirism can be dated as about 1,000 to 1,500 years B.P., inasmuch as the overlying Zuiderzee deposits (400 years B.P.) generally are not involved.
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