Newest Flcetz-Trap Formation. TS9 or Plutonifls. This veficular ftrudure, however, is in general confined to a particular fpecies of glance-coal, which is intermixed with the black- coal, not to the black-coal itfelf. This glance-coal fometimes forms whole beds; in other inftances it is intermixed with black-coal, and is found at a diflance from rocks of the trap-formation, even in diftrids where none of the rocks of that forma tion occur. 13. Like all new formations, it contains veiy fmall quantities of ores. Small veins of magnetic ironftone, and diffeminated iron-pyrites, and iron- fand, are all that have been hitherto accurately obferved in it. It is fometimes magnetic, and to 'fuch a degree as to affed the magnetic needle at a confiderable diflance. 14. Its geographic fituation, as wdl as that of wacke, will be included in the account of the ge neral diftribution of the formation. 2. Wacke*. Wacke.—Werner. ■ . , r< ■ f ■ • i V 1. This fofiil is intermediate between clay and bafalt. 2. It is fometimes fimple, but when it inclines to bafalt, it contains hornblende and mica. It is fometimes fpotted, and thefe fpots are unformed cryflals of hornblende, refembling the unformed ( cryfials of felfpar in certain varieties of porphyry. It never contains augite or olivine. When it ap proaches to amygdaloid it is veficular. 3. It * Is defcribed in the firft volume of this work.