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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 56 (1986)No. 4. (July), Pages 471-479

Waulsortian-Type Buildups and Resedimented (Carbonate-Turbidite) Facies, Early Mississippian Burlington Shelf, Central Missouri

David T. King, Jr.

ABSTRACT

The crinoidal carbonates of the Lower Mississippian (Osagean) Burlington Limestone in central Missouri consist of individual and multiple interconnected Waulsortian-type buildups and associated resedimented debris (carbonate-turbidite) facies. This association of Waulsortian-type buildups and turbidity-current sedimentation developed on the foreslope, toe-of-slope, and basinal near-toe-of-slope areas of the prograding Burlington Shelf.

The Waulsortian-type buildups contain a core facies of dolomitized, bryozoan-crinoid, lime mudstone and a flank facies of symmetrically disposed, thin-bedded crinoidal packstone and grainstone. The core developed where bryozoan-crinoid thickets trapped carbonate fines of upslope (turbidity-current) origin. Lime-mud hardgrounds in the cores developed during prolonged breaks in the influx of lime mud. The flank beds developed by in situ disarticulation of indigenous crinoids and minor gravity-slide processes.

The resedimented-debris facies are laterally continuous and normally graded grainstone and packstone. The beds show 1) a subdivision of Bouma intervals A and B; 2) coarse-tail grading; 3) scours, flutes, and load casts; 4) a generally random fabric except for crinoid-ossicle alignment in Bouma interval B; and 5) no articulation of crinoid stems or calyxes. These features, combined with the absence of infiltration textures, escape burrows, shell imbrication, and hummocky cross-stratification, are useful in distinguishing these resedimented beds from lag-suspension deposits of storm origin.

The lower part of the Burlington (5-15 m thick) consists exclusively of Waulsortian-type buildup core and flank facies. These buildups rest on a thin, laminated dolomitic shale bed (starved-basin sediment) and represent basinal near-toe-of-slope deposition. The upper and middle parts of the Burlington Limestone, corresponding to foreslope and toe-of-slope depositional settings, consist of Waulsortian-type buildups and resedimented-debris facies. Considering approximate modern analogues, the resedimented debris probably came from various linear, near-shelf margin sources. The resedimented debris contains algal-bored grains from the shelf margin and foreslope biogenic grains and clasts.


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