FAUNAS OF SOUTHEASTERN ALASKA B3n 
and southeasterly trend. The dip is high, frequently 90°. It is 
sometimes easterly, and sometimes westerly, the direction of dip 
depending on whether or not the limb of the large fold to which all this 
peninsula and the older beds on the south side of the bay belong is 
slightly overturned at any given point. The thickness of the several 
divisions of the limestones which are exposed along the north shore 
of this peninsula is indicated approximately in the following section, 
which begins about one-half mile above (northwest of) North Passage 
Point (2): 
Feet 
e. Breccia of large gray limestone fragments. . . . TOO 
d. Hard gray limestone, much fractured by numerous sala: sss oe 
breaking into small irregular fragments on weathering. Large Produc- 
toids common. Dip 30° to go° toward southwest; strike N. 40° W. . . go 
c. Gray limestone with frequent bands of black chert. Fossils scarce. 
Strikes Ne pLomtOs20.. Wi.) lpr Som tOrOO-uNe hy emeee gh ci wsn Ahem k 275 
b. Dark gray limestone with black chert bands. Fossils abundant near . 
upper and lower limits. Average strike N. 30° E. Dip 70° to 80° N. W. 250 
d= limestone similar to bs (Corals common 9.9.0.) 6) se 275 
eae) 
Exposures on the north side of the bay and just west of the penin- 
sula, which are lower but not continuous with this section, would 
add, if included in it, several hundred feet to its thickness. The 
total thickness of the Lower Carboniferous section is probably not 
less than 1,500 feet. 
The following list, furnished by Dr. Girty, includes the more 
common species in the Lower Carboniferous beds at Freshwater 
Bay: 
Zaphrentis sp. Productus aff. P. inflatus McChes. 
Crinoid fragments Spirifer aff. S. trigonalis Martin 
Diphyphyllum sp. Cleiothyris aff. suborbiculoides Mc- 
Productus giganteus Martin Ches. 
Productus punctatus Martin ? 
The Lower Carboniferous in southeast Alaska, while representing 
a different facies from that of the Mississippi Valley, is still much 
more closely allied to the Interior continental faunas than is the Upper 
Carboniferous fauna of this region. The Lower Carboniferous fauna 
is widely distributed in Alaska. If has been recognized as far north 
