black shale


Also found in: Dictionary, Thesaurus, Wikipedia.

black shale

[¦blak ′shāl]
(petrology)
Very thinly bedded shale rich in sulfides such as pyrite and organic material deposited under barred basin conditions so that there was an anaerobic accumulation. Also known as biopelite.
References in periodicals archive ?
He placed the lower boundary of the formation at the unconformity above the Alum Cave Limestone Member (Wier, 1950, 1952) but the boundary was later lowered to include both the Alum Cave and black shale underlying it in the Dugger Formation (Wier and Gray, 1961).
In addition, the Company is encouraged by the presence of fine and coarse gold coating foliated surfaces within a highly silicified and sheared black shale adjacent to the quartz veins.
Live oil recovered from shallow wells drilled by TAG in 2011, as well as oil sampled from seeps in the East Coast Basin, confirm that the source of the high-quality oil was generated from the Waipawa Black Shale and Whangai formations.
TABLE 1 Major element (oxide) chemistry of fissle black shales from X-ray flourescence analyses.
Such flooding was followed by the establishment of quiet, anoxic conditions in which the overlying black shale was deposited.
1), in coastal Maine, is underlain by pyritic black shale and laminated mudstone, pillow lava and breccia, and minor felsic flows and tuffofthe Quoddy Formation (Gates 1961, 1969,1977).
Origin of phosphatic black shale facies in Pennsylvanian cyclothems of Midcontinent North America.
The balance has now swung to investigating anomalously high rates of plankton productivity as the proximal cause of these black shale "events.
But other imprints in the smooth black shale disple any image of a peaceful prehistoric aquarium.
Some 200 tU was produced from a black shale deposit in Ranstad in the 1960s.