244 DESCRIPTIVE CATALOGUE 
tary, crystalline lumps, and much epidote, with a dark olive-green mineral, sup- 
posed to be chlorite. 
403. Basaltic rock—colour, reddish gray; fine granular; contains numerous 
grains of epidote and chlorite. 
404. Metamorphosed siliceo-argillaceous shale—calcareous ; colour, light red, with 
bluish-gray spots ; joints lined with carbonate of lime; body of the rock filled with 
grains of the same mineral. Has the appearance of having been baked. 
405. Same as No. 404—colour, reddish yellow ; siliceous; becomes quartzose in 
the vicinity of intrusive dikes; granular; fracture uneven. 
406. Metamorphosed sandstone schist—numerous grains of epidote and of iron 
pyrites disseminated through it. 
407. Same as No. 404—more highly metamorphosed, and more compact; colour, 
bluish gray and reddish yellow. All these schists are calcareous, and their specific 
gravity increases with the increase of metamorphosis. 
408. Basaltic rock—colour, dark reddish gray, almost black; contains much iron 
pyrites; effervesces with acids. 
409. Metamorphosed shale—calcareous; very compact; colour, reddish yellow ; 
fracture smooth. Is rendered porphyritic by the dissemination of a few crystals of 
flesh-red felspar. 
410. This rock bears some resemblance to the volcanic grit beds, but more to the 
quartzose porphyries of the Wisacodé River. Is porphyritic ; contains disseminated 
crystals of felspar and hornblende; in the mass, presents a granular appearance. 
Colour, flesh-red, with numerous black dots made by grains of magnetic iron. Con- 
tains some small pebbles and fragments of slate. 
411. Breccia—derived from the sand-rock beds; very cellular; contains large 
quantities of epidote ; general colour, dark brick-red; contains fragments of felspar, 
and numerous grains of magnetic oxide of iron ; slightly calcareous. 
412. From nests in No. 404—contains calcareous spar, fluor spar, and epidote. 
413. Greenstone—massive ; colour, dark gray; crystalline. 
414. Caleareous beds—contain epidote, calcareous spar, laumonite, fluor spar, and 
green earth. Under the influence of trap dikes, these beds become cherty. See 
No. 340. 
415. Fine granular quartzose shales—much bent and contorted ; colour, greenish 
gray. Contain numerous fucoidal impressions. 
416. Greenstone. 
417. Greenstone—very fine granular. 
418. Slaty greenstone—thinly laminated ; interstratified with beds of schistose 
quartz rock. 
419. Metamorphosed siliceous shale—colour, brownish red. Resembles No. 176. 
420. Basaltic rock—very fine-grained. 
421. Metamorphosed earthy schistose rock—porphyritic. 
422. Basaltic rock—colour, dark gray, with a purplish tint; slightly porphyritic. 
423. Slaty greenstone—grayish-coloured ; very calcareous; amygdaloidal. Con- 
tains epidote and small particles of native copper. 
