For your consideration ...
And yet nothing on the composition of the soil of these islands. Was it mostly a sandy soil? Most likely. Just the tidal movements alone can have enough effect over years to whittle away these island soils. Throw in many northeasters over the decades and centuries, some hurricanes, and not many loose soil islands will last. Especially if the tidal waters, while ebbing and receding, is sped up around a converging area.
I wonder when the story makers will focus on Calvert County getting narrower and narrower due to the Cliffs of Calvert erosion, constantly calving off? Which is the reason why near the entire length of the cliffs, the (navigational) water depth is only 2-3 feet deep out to a 1/4 mile, with some areas 3-9 feet deep out to near three quarters a mile off shore. At Dares Beach, pretty much the middle of the County, the water level goes from 2 to 9 feet out to 3/4 of a mile.
And as any waterman or fisherman knows, when over on the eastern side of the bay, the water is very shallow all over, such as in the Choptank, and the entire area east of buoy 76 on over the Honga River. Why? Because natural erosion of low lying lands. Taylor's Island averages only 1 to 6 feet above sea level. Maybe it'll be gone in another hundred years?