Subfacies Characteristics Location Problems
Stratified Sand -unit contacts visible

-planar or landward-dipping sand

-shell or HM laminae throughout

-variable composition, enriched shell and HM is source material permits

-may have basal lag of shell or HM

-low mud content

-proximal to mid-fan, most common in proximal

-generally supratidal

-may show eolian influence

-if land direction not known, may resemble shoreface

Normal-Graded Sand -unit contacts visible

-coarse basal lag from scour

-bioturbated or unstratified upper unit

-variable composition, shell material abundant where source material permits

-mud content increasing at unit top

-channel throat, proximal, and mid-fan

-supra-to sub-tidal

-might be bioturbated Laminated Sand subfacies
Reverse-Graded Sand -unit contacts visible

-coarsening-upward units from flow sorting or reworking

-variable composition, HM-enriched base where source material permits

-proximal fan

-supratidal

-may show eolian influence
Bioturbated Muddy Sand -unit contacts visible

-mottled non-stratified sand

-moderate shell and HM content, non-stratified

-distal fan

-inter- to sub-tidal

-difficult to interpret as washover sediments without additional information
Undifferentiated washover sediments (?) -unit contacts not visible

-mottled or peaty sediment

-moderate shell or HM content, non-stratified

-distal fan

-inter- to sub-tidal

-difficult to interpret as washover sediments without additional information

Figure 1: Factors used to characterized each of the five washover subfacies used in this study.

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