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  3. Field evidence noted in 2008 to 2023 that pertains to sea floods of the past millennium on Anegada, British Virgin Islands
  4. Rock walls mapped from 2002 airphotos and 2014 lidar topography of Anegada, British Virgin Islands

Rock walls mapped from 2002 airphotos and 2014 lidar topography of Anegada, British Virgin Islands

Dates

Publication Date
Start Date
2008
End Date
2021

Citation

Atwater, Brian F., compiler, 2023, Field evidence noted in 2008 to 2023 that pertains to sea floods of the past millennium on Anegada, British Virgin Islands: U.S. Geological Survey data release, https://doi.org/10.5066/P9TLLBOC.

Summary

This part of the data release aids in identifying places where land-clearing and wall-building, rather than a sea flood, may account for anomalous boulders and cobbles of Pleistocene limestone on Anegada. The wall shapefile delineates much of a network of walls found mainly on the east half of the island. It can be plotted in GIS with the shapefile of limestone clasts, most of which form boulder fields that trail southward from limestone knolls, promontories, and other outcrops. The comparison shows that these clast fields are most abundant on low ground in and near salt ponds, while the walls run mostly on higher ground.

Contacts

Point of Contact :
Brian F. Atwater, U.S. Geological Survey
Originator :
Brian F. Atwater
Metadata Contact :
Brian F. Atwater, U.S. Geological Survey
Distributor :
U.S. Geological Survey - ScienceBase

Attached Files

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Walls.xml
Original FGDC Metadata
View 		16.19 KB application/fgdc+xml
Walls_example.jpg thumbnail 2.35 MB image/jpeg
Walls.jpg thumbnail 1.95 MB image/jpeg
Walls.zip 317.01 KB application/zip

Purpose

The data release as a whole is intended to support assessments of hazards from unusually large tsunamis generated in the northeast Caribbean. Discounting alternatives to flooding from the sea in the emplacement of Anegada's limestone boulder fields is basic to the use of those fields to evaluate hypothetical sea-floor sources (https://doi.org/10.1007/s11069-011-9725-8 and the Lodhi dissertation cited below). Minimal overlap between boulder fields and walls of Anegada is also important in a manuscript, in preparation in 2023, on whether the precolonial sea flood terminated the island's precolonial conch fishing. The main traces of that fishing are precolonial conch heaps on a former Caribbean Sea shore near the distal ends of limestone boulder fields that head near the island's Atlantic shore. By this evidence, flows from the Atlantic that crossed and eastern part of Anegada discharged across a conch-processing area.
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