89 
coral-reef horizon as Lower Noric of the Upper Triassic. A coral fauna 
found by G. C. Martin on Iliamna lake, west of Cooks inlet, Alaska, 
was sent to Professor Smith, who reports 1 : “this coral fauna is undoubtedly 
the same as that in the Lower Noric zone of Shasta county, California, 
and has several species in common with that fauna.” The species listed 
include: Isastrea cf. profunda , Thecosmilia cf. fenestrata, Phyllocoenia cf. 
decussata, Astrocoenia cf. waltheri, Montlivaltia cf. mojsvari , etc. In the 
table — -“Distribution of Species” — are given the very closely allied forms 
of these species present in the Sutton horizon. A discussion of the closeness 
of this relationship is included under the species descriptions above. 
Later, Dr. Martin in his clarifying discussion 2 of the Triassic of Alaska 
has included a correlation of the Triassic of western North America. 
He here 8 provisionally correlates the Sutton formation of Vancouver 
island with these Lower Noric coral reefs, a conclusion in which the writer 
concurs. 
A consideration of the faunas found at the type locality of the Sutton 
limestone and in the equivalent beds on Pearson creek leads to a similar 
conclusion as to age. In the latter region occur the majority of the type 
locality species, besides some new forms. Of these latter Montlivaltia cf. 
gosaviensis belongs to the classic Lower Noric coral reefs — the Zlambach 
beds of the Salzkammergut district of the northern Alps — and the large 
pelecypod, Megalodon, abundant here, is characteristic of the Upper 
Trias of the Alps, and is especially abundant in the Noric (Dachstein 
and Hauptdolomite) of the northern Alps. Some of the other corals also, 
as noted above, have near relatives in the Alpine Zlambach beds. Isastrea 
whiteavesi is near I. profunda ; I. vancouverensis near Coccophyllum acantho- 
phorum; Calanwphyllia suMonensis is very close to Thecosmilia fenestrata 
and C. dawsoni is not far from T. oppeli t The distinction between C alamo- 
phyllia and Thecosmilia depends mainly upon the presence or absence 
of an epitheca. Yet Dr. Freeh apparently shows 4 that when the thin 
epitheca of Thecosmilia is worn away, as seems to occur very readily, 
there frequently results the typically costate Calamophyllia. He hence 
discards the latter genus. The Sutton specimens are, however, so per- 
sistently and uniformly costate, even in the centre of reef masses, that 
the writer hesitates to discard this time-honoured genus, recognizing, 
however, the close affinity that apparently exists between costate and 
non-costate forms. The difference between Isastrea and Coccophyllum 
is also difficult to note in poorly preserved specimens. Almost the only 
difference is the presence of serrations upon the septal edges in the former, 
and their absence in the latter. Calamophyllia suttonensis is also nearly 
related to the Rhaetic Thecosmilia dathrata; but there is a close resemblance 
between the corals from the Noric, the Rhaetic, and the Lias,® so that well- 
preserved specimens are needed for the correlation of isolated beds. 
1 Op. cit.,p. 95, 
* Martin, G, C., "Triassic Rocks of Alaska,” Geol. Sofe. Am., Bull. 27, pp. 685-718, 1916. 
* Op. cit., p. 709. 
4 Freeh, F. , ‘‘Die Korallenfauna der Trias,” Palseontographioa Bd. 37. 
1 Freeh, F. t “Ueber die Korallenfauna der Nordalpinen Trias,” Jahrb. K. K. Geolog. Reichaanstalt. Bd. 39, 
pp. 489-496. 
