reef rock

reef rock

[′rēf ‚räk]
(petrology)
A hard, unstratified rock composed of sand, shale, and the calcareous remains of sedentary organisms, cemented by calcium carbonate.
References in periodicals archive ?
The road section traverses winding hilly country with poor line of sight, numerous creek crossings, exposed reef rock and worn formation.
Project Description : The road section traverses flat sand clay country with poor line of sight and poor drainage, numerous creek crossings, exposed reef rock and worn formation.
He tries playing further and further away, and finally rows out to sea, only to find that the bell buoy marking reef rocks in foggy weather is missing