182 ALASKAN MINERAL RESOURCES IN 1904. [bull. 259. j 
South of Cape Lisburne. — Four miles" south of Cape Lisburne 
black, coal-bearing shales outcrop for about half a mile in a cliff] 
about 50 feet high, back of a narrow beach. The locality is nearc 
the mouth of a large creek, at which vessels have occasionally taken] 
water. On the south side the shales are in contact with massive lime-j 
stones, which are faulted over them. The outcrop of the formation] 
extends inland in a southeast direction, but its limits have not beeii 
determined. The shales are veiy much crumpled, and the inclosed] 
coal beds are often sheared, so that no continuous bed remains, bull 
the coal occurs in lenticular masses along fault planes. Maddrenj 
reports seeing a 4-foot or 5 -foot coal bed which outcropped contin- 
uously for several hundred yards inland and dipped north at an angle! 
of 60°. Small amounts of coal have been mined from the lenses noted) 
above, and Washburne reports seeing on the ground a pile of coal] 
which was mined and sacked previous to 1904. 
Cape Lewis field. — About a mile south of Cape Lewis, which is a 
promontory nearly 1,000 feet high, 11 miles south of Cape Lisburne, 
there is a second exposure of coal-bearing shales which outcrop for 
half a mile in a low cliff back of the beach. These shales carry, inl 
addition to the coal, abundant fossil plants of Paleozoic type. Except* 
in this cliff no outcrops of coal have been observed, though there are) 
occasional croppings of black shale for 3 miles southward to Cape Dyer.j 
The coal-bearing shales are overlain by thin-bedded limestones and 
black cherts and slates, which are in turn overlain by the massive 
limestones of Cape Lewis. They appear to rest comformably on the 
massive sandstone of which Cape Dyer is composed. 
The extension of the formation inland has not been determined. 
From topographic evidence it seems to extend southeastward and to 
connect with the area of similar rocks exposed south of Cape Dyer. 
The croppings of three beds of coal occur at a point about 2 miles 
south of Cape Lewis. 
The upper bed strikes N. 75° E. and dips northward at an angle oi 
40°. It is 4 feet thick, but. is considerably crushed and only line 
material can be obtained from the croppings. The seam has one 
small, indistinct parting near the middle. It could not be traced back 
from the coast on account of a heavy covering of chert and limestone- 
debris. The roof of this bed is a hard, siliceous slate; the under- 
lying beds are black slates. Two smaller beds, which could not be 
measured, outcrop south of this at intervals of about 50 yards. The- 
coal beds at this point have not been developed and have yielded nc< 
coal. Though only one bed of sufficient thickness to mine has beer 
discovered it is probable that a small amount of development woulc 
uncover several beds, some of which may be thick enough to work. 
The structure at this place does not seem greatly complicated. 
'iTiiis description is based on the work of Chester Washburne. The locality was not visited by thi 
writer. 
