Holocene Oolitic Marine Sand Complexes of the Bahamas

Rankey, Eugene C.; Reeder, Stacy

doi:10.2110/jsr.2011.10

Cited by 110 publications

(43 citation statements)

References 52 publications

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“…Yet, the specifics of the avulsion regime are in some respects unique, even compared to those of nearby alluvial rivers and deltas. This reinforces the notion that geomorphic systems are characterized by (at least) two sets of controls – global laws that apply everywhere and always, and idiosyncratic local factors that are both geographically and historically contingent (Phillips, ; Marston, ; Rankey and Leeder, ).…”

Section: Discussionsupporting

confidence: 76%

Log‐jams and avulsions in the San Antonio River Delta, Texas

Phillips

2012

Earth Surf Processes Landf

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The San Antonio River Delta (SARD), Texas, has experienced two major avulsions in the past 80 years, and a number of other historical and Holocene channel shifts. The causes and consequences of these avulsions – one of which is ongoing – were examined using a combination of fieldwork, geographic information system (GIS) analysis, and historical information to identify active, semi‐active, and paleochannels and the sequence of shifting flow paths through the delta. The role of deposition patterns and antecedent morphology, large woody debris jams, and tectonic influences were given special attention. Sedimentation in the SARD is exacerbated by tectonic effects. Channel aggradation is ubiquitous, and superelevation of the channel bed above the level of backswamp areas on the floodplain is common. This creates ideal setup conditions for avulsions, and stable, cohesive fine‐grained banks favor avulsions rather than lateral migration. Flood basins between the alluvial ridges associated with the aggraded channels exist, but avulsions occur by re‐occupation of former channels found within or connected to the flood basins. Large woody debris and channel‐blocking log‐jams are common, and sometimes displace flow from the channel, triggering crevasses. However, a large, recurring log‐jam at the site of the ongoing avulsion from the San Antonio River into Elm Bayou is not responsible for the channel shift. Rather, narrow, laterally stable channels resulting from flow splits lead to accumulation of wood. Some aspects of the SARD avulsion regime are typical of other deltas, while others are more novel. These includes avulsions involving tributaries and subchannels within the delta as well as from the dominant channel; tectonic influences on delta backstepping and on channel changes within the delta; avulsions as an indirect trigger for log‐jam formation (as well as vice‐versa); and maintenance of a multi‐channel flow pattern distinct from classic anastamosing or distributary systems. Copyright © 2012 John Wiley & Sons, Ltd.

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Section: Discussionsupporting

confidence: 76%

Log‐jams and avulsions in the San Antonio River Delta, Texas

Phillips

2012

Earth Surf Processes Landf

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“…It is possible that the north east of the Exuma Sound in particular might have a greater carrying capacity for deep-water organisms given the strong (~ 90 cm s -1 ), highly directional surface current that flows on and off the shelf in the area (Rankey and Reeder, 2011), that likely delivers greater food fall from the shallow water and terrestrial ecosystems than in other parts of the sound. The importance of shallow water and terrestrial primary production for deep-water ecosystems, in areas where the continental shelf is very narrow has yet to be investigated.…”

Section: Resilience To Longline Capturementioning

confidence: 99%

First description of deep-water elasmobranch assemblages in the Exuma Sound, The Bahamas

Brooks

Williams

et al. 2015

Deep Sea Research Part II: Topical Studies in Oceanography

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“…The development of the Joulters sandbody provides one possible scenario for the evolution of the bar and channel physiography seen elsewhere in Bahama sand shoal complexes (Ball, ; Halley et al., ; Harris, Purkis, & Ellis, ; Rankey & Reeder, ). The shoal‐generating physiography has been erased as bar and channel topography was extinguished and filled in to form the vast sand flat, and ooid sands were mixed with other sediments by burrowing.…”

Section: Application To the Ancientmentioning

confidence: 99%

Lessons from a modern carbonate sandbody – A personal experience of comparative sedimentology

Harris

2019

The Depositional Record

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The notion that examination of modern environments can help one better decipher ancient deposits does not seem so unusual, but this view was incrementally developed through decades of studies that have shown just that. Presented here is a brief example of comparative sedimentology with emphasis placed on the lessons learned from the study of a modern ooid sandbody that heightens one's ability to describe and interpret analogous subsurface settings. Core transects and surface sediment mapping in the Joulters sandbody of Great Bahama Bank illustrate the three‐dimensional characteristics of an upward coarsening and shallowing cycle and highlight the internal complexity of a sandbody through time and space. This modern example graphically highlights difficulties in interpretation and correlation of grainstone cycles in analogous subsurface platform carbonate reservoirs.

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Holocene Oolitic Marine Sand Complexes of the Bahamas

Cited by 110 publications

References 52 publications

Log‐jams and avulsions in the San Antonio River Delta, Texas

Log‐jams and avulsions in the San Antonio River Delta, Texas

First description of deep-water elasmobranch assemblages in the Exuma Sound, The Bahamas

Lessons from a modern carbonate sandbody – A personal experience of comparative sedimentology

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