posted on May, 18 2003 @ 06:21 PM
After looking at these photos, it seems that, at least where this structure was found, seems to be around a good limestone outcrop.
The large rocks photographed appear to be well weathered (karstic) limestone, as evidenced by the flat upper sides in at least a couple of the photos.
The large rounded ones I could not be sure as they were well overgrown with algea.
This does fit with what I read that at least part of the area is jointed limestone, although the size of the boulders indicates that it is rather
competent (solid), which could lend itself to excavation of underground structures.
In addition, the one photo that shows a lot of the large limestone pieces with flat sides, that is indicative of excavated limestone (often called rip
rap). If they were naturally weathered, they would form thinner platelike pieces, that readily weathered into a marly chalk like material, and also
often weathers to a black color.
The struture indicated appeared to be some kind of rebar reinforced drainage culvert, or other subsurface reinforcement structure (was meant to be
buried and support itself with a sizeable overburden load).
My interpretation of this looks like something was excavated (not sure how much of this material was there, but seems to be a large volume from the
pics) from a rather solid limestone rock unit, and the removed material was dumped on this shoreline, possibly to provide erosion protection. As for
the culvert structure, maybe it was part of an underwater entrance?
MM, WOS, either of you guys SCUBA certified?