anchor stone

anchor stone

[′aŋ·kər ‚stōn]
(geology)
A rock or pebble that has marine plants attached to it.
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References in periodicals archive ?
A tomb from 1400 BC has an anchor stone shaped like a T showing how things had progressed in 200 years.
Other cargo and artifacts found with the wreck were raw ivory and hippo teeth, African Blackwood logs, traces of spices and oils, Cypriot and Syrian pottery, operculum shells, used to make incense, jewelry, ostrich eggs and 24 anchor stones.
The formation is described as being composed of petrified wood, with iron washers, rivets, and brackets that held the ark walls together, and anchor stones that served to stabilize the ark.
Although it would be difficult now, due to the overhanging branches of the copper beech tree, there was once a grass court on the front lawn and one of the anchor stones, used to secure the net post, is still visible.