chert sentence examples

• The upper beds of the third limestone are often dark colored, and contain layers of black chert in nodules.
• Chert nodules abound.
• However, in comparison to group 4, radiolarian chert is virtually absent.
• The pieces of gray chert were found on the tourist path below slopes too steep for human habitation.
• Chert grits, some small cavities, quartz dust in the clay matrix.
• Figure 5. the aging process of casa montero's cherts: x-ray diffraction pattern of opal and opaline chert obtained from the same nodule.
• Chert fragments, with a few very small to large cavities from former grits.
• In fewer instances, layers of the limestone seem to be converted into white chert, called china stone.
• Chert cobbles belonging to the terrace deposits.
• Chert pebbles becoming more angular with depth ( carr and blackley 1969 ).
• Chert flake was visible at the surface of the feature.

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