. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography is ROBERT S. DIETZ AND JOHN C. HOLDEN BLOCK FAULTS ROTATIONAL FAULTS REVERSE OR THRUST FAULTS COMPRESSIONAL FOLDS ARCHING OR UPLIFT DIFFERENTIAL SUBSIDENCE. REEF GROWTH VOLCANIC CONSTRUCTION PLUTONIC INTRUSION Fig. 3.—Shelf-margin ridges. Buried outer ridges discovered by seismic methods along some continental margins may have many origins, some of which are shown in this diagram from Burk (1968). Unless they de- form the miogeoclinal wedge, indicat
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography is ROBERT S. DIETZ AND JOHN C. HOLDEN BLOCK FAULTS ROTATIONAL FAULTS REVERSE OR THRUST FAULTS COMPRESSIONAL FOLDS ARCHING OR UPLIFT DIFFERENTIAL SUBSIDENCE. REEF GROWTH VOLCANIC CONSTRUCTION PLUTONIC INTRUSION Fig. 3.—Shelf-margin ridges. Buried outer ridges discovered by seismic methods along some continental margins may have many origins, some of which are shown in this diagram from Burk (1968). Unless they de- form the miogeoclinal wedge, indicating that they were tectonically active during its deposition, these highs cannot be considered as tectonic borderlands in sense of Kay (1951). This pertains to those highs off the eastern United States where an undeformed Jurassic-to-Recent wedge overlaps shelf-edge buried ridge, which must, therefore, be at least as old as Jurassic. One possible explanation of the east coast ridge is that it is the outer flank of a graben associated with initial continental rifting. More likely explanation is that ridge is an Early Cretaceous shelf-ridge reef, an extension of that known from the Gulf Coast, west margin of Florida, and Bahama platform. Continental drift reconstructions reveal that eastern seaboard was then nearer equator than now (Dietz and Holden, 1970). MIOGEOSYNCLINES AND EUGEOCLINES Several years ago we (Dietz and Holden, 1966) proposed the term miogeocline as a sub- stitute word for miogeosyncline. This was partly in the interest of simplicity but, more im- portantly, to emphasize that miogeosynclines are seaward-thickening prisms of shallow-water sediments laid down mostly above surf base. Thus, miogeosynclines comprise only half of, or one limb of, a syncline. We pointed out that all folded and cratonized miogeosynclines seem to have this aspect. Further, it seemed unlikely to us that the outer limb of the miogeosyncline was lost by uplift, thrusting, and subsequent er
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