374 PALEOZOIC ROCKS OF THE HUDSOX BAY REGION 



Thickness 

 in feet 

 Atrypa reticularis. 



Athyris fultonensis. 

 A short gap in exposure 



7. Limestone, brown, nodular, with very many shells of 

 Atrypa reticularis var. ; exposed in the west bank 

 near the head of Long Rapids and on the island op- 

 posite ; this is thought to represent the horizon of 



the g3psum along Moose River 28 



A short gap in exposure 



6. Dolomite, brown, massive, rather soft and vesicular, 

 well exposed on both sides of the river at the foot 

 of Coral Portage ; containing the fossils listed 



below : 28 



Streptelasma cf. prolifica. 

 CyatJiophyllum sp. (large coralla). 

 HeUophyllum aff. halli. 

 Heliophylliwi sp. (compound coralla). 

 Phillip sastrcea verneuili. 

 Diphyphyllum cf. simcoense. 

 Gystiphyllum cf. vesiculosum. 

 Favosites hasaltica. 

 Favosites radicifor^mis. 

 Favosites turhinata. 

 Favosites sp. 

 Alveolites squamosus. 

 Syringopora rnaclurea. 

 Syringopora noMlis. 

 Syringopora sp. (with small corallites). 

 Stroplieodonta demissa. 

 Schizo2)ho7na ioioeiisis. 

 5. Alternating layers of bluish gray shale and shaly 

 limestone, each 5 to 8 inches thick, the more pure 

 limestone layers containing the fossils listed be- 

 low : exposed between Coral and Sextant portages . 21 

 Stropheodonta demissa. 

 Conocardium cf. trigonale. 

 Middle Devonian series ( ? ) 



Sextant sandstone and shale 



4. Conglomerate, gray, containing small pebbles and a con- 

 siderable amount of sand, cemented with calcium car- 

 bonate ; exposed at Sextant Rapids 1% 



3. Shale, sandy, red, exposed at Sextant Rapids 8 to 10 



2. Sandstone, soft, red, poorly sorted, and irregularly bedded, 

 arkosic, bearing several thin sills of basalt; exposed at 



Sextant Rapids 27 



1. Conglomeratic sandstone, with intruded sills of basalt; 

 well exposed in the west bank of the river a short dis- 

 tance above Sextant Rapids; to contact with basic in- 

 trusion in the bed of the river 35 



