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Many tools are fabricated in a green radiolarian chert or in Ramah quartzite.
Indeed, the concretions display exceptionally low contents of [SIGMA]REE, slight LREE enrichment, and occasional positive Eu anomalies, quite different from the patterns observed in the sedimentary chert (Figure 4).
The chemical and mineralogical compositions of chert samples were obtained by means of X-ray fluorescence (XRF) and X-ray powder diffraction (XRPD), respectively.
It was only much later, during the course of fieldwork focusing on stone vocabulary, that I ascertained that its meaning was in fact a raw material type meaning 'chert', and that it could be used of chert in its raw state or of any object manufactured of chert.
There is a heavy emphasis on the use of quartz and rhyolite in the debitage, compared to an emphasis on chert and rhyolite for formal tools (Table 6).
Period Group Formation Lithology Aquifer potential Lower Balqa Umm Rijam Chert, Semi aquifer Tertiary (B4) limestone Muwaqqar Chalk, Aquitard (B3) Marl Al Hasa Phosphate Good (B2a) aquifer Amman Silicified Aquifer (B2b) Limestone interrupted Wadi Ghudran Chalk, aquiclude (Bl) Chalky marl Cretaceous Ajlun Wadi As Sir Limestone good aquifer (A7) Shueib Marly Aquitard to badly (A5-6) Limestone developed aquifer Hummar Dolomitic Semi aquifer (A4) Limestone Fuhais Marl Aquitard, partly (A3) semi aquifer Na'ur Marly Semi aquifer (Al-2) Limestone Period Group Thickness (meter) Lower Balqa 70 m Tertiary 60-70 m 60 m 50 m 20 m Cretaceous Ajlun 20 m No outcrop No outcrop No outcrop No outcrop Table 2.
The two ball chert zones in the middle Fredonia occur in a lithographic to finely crystalline limestone interval; white to gray color and includes spirifer brachiopods, horn corals, and the rugose coral (Lithostrotion harmodites).
Keywords: obsidian, New Britain, chert, stemmed tools, mid-Holocene, sources
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.