The chert and flint employed were from the gravels that lie between Newton Abbot and Torquay.
Seven specimens were of basalt and one each of chert and porphyry.
He mun ha' summut to prop his ribs out, lass, as he delves through th' chert and tood-stone.
The chert has sometimes the appearance of calcedony, and is finely striped.
The crystalline varieties, no less than the compact blue limestones, embrace numerous masses of chert or hornstone.
In the same limestone there are enormous beds of chert, agates, and carnelians.
Immediately beneath the skulls were unearthed 12 objects of chert fashioned with great care.
Nodules and layers of "chert" (an impure kind of flint) occur in it, whilst in places it forms a hard rock called "firestone."
Most examples are made of Ft. Payne chert but other local materials were also used.
Limestones lose their calcium carbonate by solution, leaving only clay with fragments of quartz or chert as impurities.
"flint-like quartz," 1670s, of unknown origin. Apparently "a local term, which has been taken into geological use" [OED].
A hard, brittle sedimentary rock consisting of microcrystalline quartz. It is often reddish-brown to green but can also occur in a variety of other colors, especially white, pink, brown, or black. Chert often contains impurities such as calcium, iron-oxide, or the remains of silica-rich organisms. It usually occurs as nodules in limestone and dolomite and has curved fractures.