A geological period 208-146 million years ago. Dinosaurs and early birds inhabited this period
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Tag: <span>J</span>
The use of a high-temperature flame to fuse a rock target, and a stream of water to induce decrepitation and fragmentation, and to flush the fragment out of the target. This technique is progressively used to drill a desired length.
A machine in which pulverizes ore fed between 2 oscillating steel plates.
A hard, monoclinic mineral, 4[NaAlSi2O6] of the pyroxene group, commonly used in jewelry
A portable, moving mount for a jackhammer
A handheld, automatically rotated percussive rock drill usually powered by compressed air