About 50 specimens, mostly proximal ends, preserved in partial relief on two small pieces of shale.
Reefs have been exhumed by erosion of overlying shales.
Fragments of shale and chert are indicative of parent material of lower regional metamorphism than the gneissic fragments.
Subsequent abrupt deepening led to deposition of a thick black shale unit, turbidite deposits and large-scale submarine channel-fill deposits.
Bioturbation is abundant in the shale as both horizontal and vertical exichnial traces.
In analogy with impact heating, the target (in this case the shale) was not progressively heated but heated relatively rapidly.
The stippled bands represent the lower and upper black shales.
Most likely the organic matter is derived from the carbon- and uranium-rich bituminous shale of the target.
中文繁体
頁岩…
More中文简体
页岩…
MoreEspañol
shale, esquito arcilloso, esquisto…
MorePortuguês
xisto argiloso, folhelho…
MoreFrançais
schiste (bitumineux)…
MoreČeština
břidlice…
MoreDansk
skifer…
MoreIndonesia
serpih, batuan endapan…
More