Likewise, the limit line of the Clear Creek Chert
Petrofacies (P3): esta con respecto a las otras tiene presencia de feldespato microclina, alto contenido de plagioclasa y liticos metamorficos (filitas micaceas, cloriticas y grafitosas), sedimentarios (lodolitas y limolitas), volcanicos como tambien presencia de cuarzo policristalino foliado, chert
, feldespato, micas e intraclastos siliciclasticos.
In addition, two chert
flakes with intact striking platforms (OLH-TP1-10-002 and OLH-TP1-10-003) have had their ends snapped through a distinctively retouched notch.
These people were involved in an intricate exchange network in Ramah chert
that extended from the Ramah Bay area as far afield as southern Quebec and New England, and included Middle Dorset and Late Dorset Palaeoeskimo groups in Labrador.
Two periods of searing-hot hydrothermal activity had cooked both the seafloor cherts
and the surface glacial sediments.
Debitage: The C1 debitage assemblage contains 1152 items and is dominated in numbers by flake fragments and secondary retouch flakes of chert
and chalcedony (Table 6).
In the case of the ex-situe oil shale mining; the oil shale in the study area froms from the Muwaqqar (Chalk Marl) Formation; This Formation is composed of marl, chalky limestone, micritic limestone and chert
and overlaid the main aquifer in the study area.
En la parte superior se presenta una capa gruesa de 10 m de arenisca color marron de grano muy grueso a grava, de composicion chertarenita con el 100% de clastos de chert
The Lost River Chert
Bed is found above the Goodes Cave entrance in a sequence of sublithographic and micritic limestone beds bearing brachiopods and fenestrate bryzoas.
The nature of chert
exposures in the Passismanua area of West New Britain, Papua New Guinea is reviewed in light of reports of worked seams of chert
in five caves.
Also, in some places around Alston, the Scar Limestone is rich in nodules of chert
- essentially the same hard material as flint.
However, a new study has claimed that the Apex Chert
formation found in Western Australia's Pilbara region is not biological material at all.