A deposit of sand cutting through sedimentary strata in the manner of an igneous dyke, formed by the filling of an underwater fissure.
〔地质〕水成岩墙
Example sentencesExamples
The sample was collected from the redeposited tuff filling a neptunian dyke in the SW wall of the Liter quarry.
Carbonates from the middle unit directly overlie volcanic rocks and consolidated Messinian marls, cross-cut by neptunian dykes with a bryozoan rudstone filling.
Therefore we correlate the ash-fall episode recorded at Katraboca with that represented by the tuff filling the neptunian dyke of Liter.
A neptunian dyke is a sheet of sediment or sedimentary rock, usually vertical or subvertical, which cuts across any other rock type and, at first glance, resembles an igneous dyke.