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XX i 34:

Foraminifera.

Hyolithellus? sp.

Stenotheca, 2 sp.

Conularia sp.

Micromitra (Iphidella) pannula (White).

Acrotreta, 4 sp.

Ostracodes, 4 sp.

Agnostus, 3 sp.

Agraulos, 3 sp.

Ptychoparia, 2 or 3 sp.

Anomocare sp.

Dorypyge? sp.

Neolenus? sp.

Solenopleura, 3 sp.

L. D. Burling, in 1912, made six collections:

4730, 4731, 4732, and 4733. Squaw Mountain north of Tatonduk River, international boundary.

4734 and 4689. Jones Ridge, north of Tatonduk River, international boundary. C. E. Resser, of the United States National Museum, who has lately been studying this material, gave to the writer the following partial list of genera occurring in these collections:

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All of Cairnes's Cambrian fossils, with the exception of collection XX i 34, which was believed to be possibly of Middle Cambrian age, were referred by Burling to the Upper Cambrian, and so far as the writer is aware no later work has been done on this material. Collection 4689, made by Burling, is referred by Resser to the upper part of the so-called "Canadian system," or, in the United States Geological Survey nomenclature, to the Beekmantown group of the Lower Ordovician series. Collections 4730 to 4734, also made by Burling, are referred by Resser to the Upper Cambrian of Ulrich, which in United States Geological Survey nomenclature is the lower part of the Upper Cambrian. Hence it would seem that the Upper Cambrian series is rather fully developed as marine limestones along the boundary.

Cairnes collected Ordovician fossils along the boundary but not within the area covered by this report, and lists of those fossils are therefore not here included. The fossils of Ordovician age collected

by Harrington in 1909 came from the gravel of the Tatonduk River near the boundary and consisted entirely of Columnaria alveolata. The presence of this species, of course, has little stratigraphic value, because the gravel in which it occurs may have been transported many miles.

Cairnes's Silurian fossils include 8 collections of middle Silurian age and 11 collections of upper Silurian age. Of the 8 middle Silůrian collections, only 6 were obtained within the area covered by this report, and these are given herewith. The determinations were made by E. M. Kindle, of the Geological Survey of Canada.

XIX s 28:

Pholidops cf. P. squamiformis Hall.

Atrypa sp.

Atrypa cf. A. marginalis Dalman.

Orthis flabellites Foerste.

Dalmanella cf. D. elegantula (Dalman).

Whitfieldella cf. W. nitida Hall.

Anoplotheca sp.

Illaenus cf. I. armatus Hall.

XIX f 31:

Stropheodonta sp.

Rhipidomella n. sp.

Gypidula? sp.

Clorinda cf. C. fornicata (Hall).

Sphaerexochus sp.

Illaenus cf. I. imperator Hall.

XIX h 31:

Stropheodonta sp.

Orthis flabellites Foerste.

Dalmanella cf. D. elegantula (Dalman).

Meristina sp.

Spirifer radiatus Sowerby.

Spir fer sp.

Sphaerexochus romingeri Hall.

Illaenus cf. I. imperator Hall.

Brontiopsis sp.

XIX m 6:

Cladopora sp.

Favosites sp.

Zaphrentis sp.

Camarotoechia? cf. C. acinus Hall.

Camarotoechia? cf. C. indianensis (Hall).

Atrypa sp.

Atrypina sp.

Nucleospira cf. N. pisiformis Hall.

Trematospira cf. T. camura Hall.

Sieberella n. sp.

Mytilarca? cf. M. sigilla Hall.

Platyceras sp.

Orthoceras sp.

Dalmanites sp.

XVII h 13:

Camarotoechia cf. C. indianensis (Hall).

Stropheodonta sp.

Atrypa reticularis (Linnaeus) var.

Spirifer radiatus Sowerby.

Reticularia cf. R. proxima Kindle.

Pterinea, small sp.

Proetus sp.

XII 1 30:

Favosites gothlandicus Lamarck.

Heliolites interstincta (Linnaeus).

Halysites catenulatus (Linnaeus) var.
Cyathophyllum sp.

Of the 11 upper Silurian collections made by Cairnes, only 1 was found within the area here described, and this is given as follows:

XIX t 27:

Whitfieldella sp.

Atrypa reticularis (Linnaeus).

The single Silurian (?) collection made by the writer from the limestone of the Tatonduk River was examined by Edwin Kirk, of the United States National Museum. The locality of this collection and its fauna, as given by Kirk, follow:

25AMt168 (2064): Diphyphyllum sp.

Alveolites sp.

Crinoid columnals.

Cairnes's Devonian fossils also were determined by Kindle. They include, within the area here treated, 15 collections, of which 12 were assigned definitely to the Middle Devonian and were correlated with the Salmontrout limestone of the Porcupine River. The other three collections were believed to belong to some other horizon in the Devonian. The Middle Devonian fauna is listed below:

XVII p 4, 5:

Favosites sp.
Camarotoechia sp.

Pugnax cf. P. pugnus (Martin).

Atrypa reticularis (Linnaeus) var.

Leptaena rhomboidalis (Wilckens).

Schizophoria striatula (Schlotheim).

Reticularia sp.

Anoplotheca cf. A. acutiplicata (Conrad).

Platyceras sp.

Cytherella sp.

Cyphaspis cf. C. bellula.

XVII j 16, j 17, i 16, i 15:

Atrypa reticularis (Linnaeus).

Atrypa spinoza Hall.

Schizophoria striatula (Schlotheim).

Reticularia? cf. R. subundifera (Meek and Worthen).

XVII j 16, j 17, i 16, i 15-Continued.

Reticularia sp.

Athyris? n. sp.

XVII j, k 16:

Zaphrentis sp.

Favosites sp.

Stropheodonta sp.

Atrypa reticularis (Linnaeus).
Schizophoria striatula (Schlotheim).

Gypidula sp.

XVII h 19, i 19:

Crinoid stems.

Productella sp.

Atrypa reticularis (Linnaeus).

Reticularia cf. R. laevis (Hall).

Reticularia cf. R. subundifera (Meek and Worthen).
Nucleospira sp.

Fish bone.

XVII i 14, i 13:

Cyathophyllum sp.

Atrypa reticularis (Linnaeus).

Camarotoechia contracta Hall?

Stropheodonta arcuata Hall.

Reticularia sp.

Nucleospira n. sp.

Proetus sp.

XVII h, i, 18, 19:

Favosites cf. F. basaltica Goldfuss.

Favosites cf. F. canadensis (Billings).

Alveolites sp.

Schizophoria striatula (Schlotheim).

Chonetes sp.

Atrypa reticularis (Linnaeus).

Martinia cf. M. maia (Billings).

Nucleospira sp.

Proetus sp.

XIX h 19:

Zaphrentis sp.

Atrypa reticularis (Linnaeus).

Stropheodonta sp.

Camarotoechia sp.

Meristella? sp.

Meristella cf. M. laevis (Vanuxem).

Pugnax pugnus (Martin) var.

Gypidula sp.

XIX i 20:

Productella cf. P. spinulicosta Hall.

Stropheodonta sp. Indentical with Stropheodonta sp. in XIX h 19.

Atrypa reticularis (Linnaeus).

Schizophoria striatula (Schlotheim).

Gypidula sp.

XIX p 10:

Cyathophyllum? sp.

Atrypa reticularis (Linnaeus).

Leptaena rhomboidalis (Wilckens).

Spirifer sp.

XIX q 23:

Fenestella sp.

Atrypa reticularis (Linnaeus).
Atrypa cf. A. flabellata Goldfuss.
Stropheodonta cf. S. arcuata Hall.

Conocardium cf. C. cuneus Conrad.

XIX i, j, h, 23, 22:

Atrypa reticularis (Linnaeus).

Stropheodonta sp.

Schizophoria striatula (Schlotheim).

Cryphaeus? sp.

XIX d 22:

Cyathophyllum cf. C. quadrigeminum Goldfuss.

Crinoid stems.

Atrypa reticularis (Linnaeus).

Camarotoechia sp.

Gypidula sp.

Conocardium cf. C. cuneus Conrad.

Platychisma? sp.

The other three Devonian collections by Cairnes are:

XVII j 15:

Productella? sp.

Atrypa n. sp.?

Martinia cf. M. maia Billings.

Stropheodonta sp.

Proetus cf. P. macrocephalus Hall.

XVII p 4, 5:

Cyathophyllum cf. C. quadrigeminum Goldfuss.

Favosites sp.

XVII p 5:

Favosites sp.

Camarotoechia sp.

Hercinella? sp.

The localities and character of the Middle Devonian collections made by Harrington from the undifferentiated limestone of the boundary are as follows; the faunal determinations were made by Edwin Kirk:

736. 6.75 miles north and 3.5 miles east from intersection of one hundred and forty-first meridian and sixty-fifth parallel:

Crinoid columns.
Stropheodonta sp.

Camarotoechia sp.

Atrypa reticularis.

Conocardium sp.

62744-305

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