I’ve been told only a little about this thirty square mile area south of Martha’s Vineyard, that’s filled with fine-grained sand. There was a time that depth of the water column was measured by throwing down lead lines and bringing them up to deck — this sandy mud signaled mariners that they were close to the island of Martha’s Vineyard. If you double-click on the map it will display bigger and you can read the legend.
This material is challenging to apply and I can’t brush it on. A thick even coating of it isn’t visually appealing to me so I dip leather-hard clay into it and wipe it off, usually in stripes. I need to move quickly because the flowing quality of the wet mud changes to a crumbly quality.