Those mounds are on Shark River Reef. Look it up on NJ DEP site. All of the rockpile and wreck positions are listed.
https://njdep.maps.arcgis.com/apps/webappviewer/index.html?id=01e06ca960a3414381fc69b797a52901
https://dep.nj.gov/njfw/wp-content/uploads/njfw/Shark-River-Reef.pdf
We did well...