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- W2271898428 abstract "The Wayne Formation of central Tennessee ranges from latest Llandoverian (C6) to early Ludlovian in age on evidence of its conodont fauna. The basal shale of the Maddox Member (lowermost unit) represents an initial influx of terrigenous detritus across a broad Silurian shelf (Pterospathodus amorphognathoides Zone). Overlying skeletal wackestones formed in relatively quiet-water, offshore environments (Kockelella ranuliformis Zone). The appearance of abraded skeletal packstones in the upper part of the Maddox indicates a change to a shallower, more strongly agitated environment (K amsdeni Zone). The Waldron Member, which overlies the Maddox, represents a pulse of terrigenous clastics that interrupted carbonate deposition (K. amsdeni Zone). The presence of skeletal wackestones at the base of the overlying Lego Member suggests a return to quiet-water environments (K. amsdeni Zone). The occurrence of abraded skeletal packstones and grainstones in the upper part of the Lego indicates a transition to shallow-water, strongly agitated environments (K stauros-K. variabilis Zones). Argillaceous wackestones at the base of the uppermost member, the Dixon, represent the spread of fine terrigenous clastics across the shelf (K. variabilis Zone). Three intergrading conodont biofacies occur in the Wenlockian part of the Wayne Formation. The Panderodus unicostatus Biofacies is the least diverse and abundant, and is dominated by the nominal species. It occurs in the upper part of the Maddox Member in the northernmost sections in Tennessee, and dominates the Lego and basal beds of the Dixon Member. It is characteristic of shallow-water, high-energy environments where the destruction of elements was greatest. The biofacies is largely a result of postmortem processes, and does not reflect accurately the original conodont association. The Mixed Biofacies is more diverse and abundant, and is not dominated by any one species. It occurs in the lower part of the Maddox Member, in the Waldron Member, and is restricted to the southernmost sections of the Lego Member. The Mixed Biofacies is char- acteristic of relatively quiet-water environments. The Dapsilodus obliquicostatus Biofacies is the result of a dramatic increase in the abundance of the nominal species in the most offshore envi- ronments. It is restricted to a few samples near the base of the Maddox Member and within the Waldron Member in the southernmost sections. Like planktic foraminifers, Dapsilodus obliquicostatus may have been a species of high produc- tivity that favored offshore to oceanic conditions. The other conodont species formed variable associations whose average composition changed little over the broad Wenlockian shelf, in the same manner as species of benthic foraminifers might have been distributed." @default.
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- W2271898428 date "1983-03-01" @default.
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- W2271898428 title "WENLOCKIAN (SILURIAN) CONODONT BIOSTRATIGRAPHY, BIOFACIES, AND CARBONATE LITHOFACIES, WAYNE FORMATION, CENTRAL TENNESSEE" @default.
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