barrier islands are large deposits of compressed sand and silt being washed over slowly eroding bedrock, on otherwise unprotected ocean coastline, for thousands or millions of years
Can’t imagine how deep one needs to go with a foundation to find something solid to build a skyscraper upon.
“Can’t imagine how deep one needs to go with a foundation to find something solid to build a skyscraper upon.”
you can’t ... which is why buildings and structures in such coastal areas are held up by driving in enough pilings deep enough that the friction of the soil/sand surrounding those pilings is what actually holds those structures from sinking ...