Figure 3 from DeJong et al.: Time Series of the Blackwater River Valley. (IMAGE)

Geological Society of America

Figure 3 from DeJong et al.: Time Series of the Blackwater River Valley.

Caption

This is a time series of the Blackwater River valley. Top: Intact marsh surveyed from AD 1902 to AD 1904 and presented in a 7.5" USGS topographic map from AD 1905; dark blue hatching around the Blackwater valley is tidal marsh; light blue pattern is freshwater swamp. Middle: Initiation of major ponding seen in an aerial photograph from AD 1938. Bottom: Coalesced ponds forming the informal 'Lake Blackwater' in satellite imagery from AD 2007.

Credit

<i>GSA Today</i>, DeJong et al., and credits within the caption.

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Credit: <i>GSA Today</i>, DeJong et al., and credits within the caption.

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