Editing A sequence-stratigraphy scheme of the Late Carboniferous, southern North Sea, Anglo-Dutch sector
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=== 7.1 Early Langsettian (A. lenisulcata zone) === | === 7.1 Early Langsettian (A. lenisulcata zone) === | ||
− | The Early Langsettian is characterized by generally argillaceous swamp or lake sediments ([[:File:YGS_CHR_06_ASEQ_FIG_06A.jpg|Figure 6A]]) and contains many marine bands and thin coals (facies association B). The Subcrenatum Marine Band at the base of the Langsettian is in the expected position for the underlying maximum flooding surface. The underlying Namurian Rough Rock on this basis therefore would be a TST, as suggested by Church & Gawthorpe (1994). | + | The Early Langsettian is characterized by generally argillaceous swamp or lake sediments ([[:File:YGS_CHR_06_ASEQ_FIG_06A.jpg|Figure 6A]]) and contains many marine bands and thin coals (facies association B). The Subcrenatum Marine Band at the base of the Langsettian is in the expected position for the underlying maximum flooding surface. The underlying Namurian Rough Rock on this basis therefore would be a TST, as suggested by Church & Gawthorpe (1994). Collin-son et al. (1992) interpreted the latest Namurian as a lowstand sequence, and Hampson (1995) demonstrated several sequences in the Rough Rock with a TST at the top. |
The nine marine bands recorded by Calver (1968) in the overlying strata of the East Midlands and elsewhere, up to and including the Burton Joyce Marine Band, may be flooding surfaces of fourth-order sequences or parasequence boundaries within a third-order composite sequence. Such common flooding surfaces might be expected within an HST characterized by continually rising sea level, although at a diminishing rate of rise to that represented at the MFS. In upward progression, the marine bands are the Holbrook, Second Smalley, First Smalley, Alton, Parkhouse, Forty Yard, Norton and Upper Band. | The nine marine bands recorded by Calver (1968) in the overlying strata of the East Midlands and elsewhere, up to and including the Burton Joyce Marine Band, may be flooding surfaces of fourth-order sequences or parasequence boundaries within a third-order composite sequence. Such common flooding surfaces might be expected within an HST characterized by continually rising sea level, although at a diminishing rate of rise to that represented at the MFS. In upward progression, the marine bands are the Holbrook, Second Smalley, First Smalley, Alton, Parkhouse, Forty Yard, Norton and Upper Band. |