Geological Papers, 111 



Ocinebra interfossa (Cpr.) Figure 19. 



Shell fusiform; spire elevated; whorls five in number, each or- 

 namented by five (and a trace of the sixth) rough, subangular, 

 spiral lines which are very prominent on the anterior-posterior 

 portion of the shell ; also by cross-lines in the posterior portion 

 and by incremental lines near suture ; suture deeply appressed, dis- 

 tinct; aperture subelliptical ; outer lip thickened; canal shallow, 

 produced by an angulation of the lip. 



Dimensions: Alt., 10 mm.; lat., 6 mm.; aperture, 5.5x4.5 mm. 



Vermetes species. Figure 18. 



Specimens of this species are abundant in this clay. They usu- 

 ally crumble, however, on exposure to the air. 



Englacial and Subglacial Till. — This till covers practically 

 the whole area, even the estuary regions, it being worked over 

 wholly or in part in these regions by sea action. Its composition 

 is principally sands and gravels to which a great number of bould- 

 ers are added in the morainic regions. The formations of this till, 

 the most conspicuous of which are marked on the map, are lateral 

 moraines, dump-terminal moraines, push-medial moraines, kames, 

 and kettle-holes, drumlins, ridge-eskers, overwash-marine delta 

 deposits, etc. 



Lateral Moraines. — A ridge apparently of this type was ob- 

 served southeast of the northeast diagonal road leading into Bel- 

 lingham. It was not examined, but its position would seem to 

 indicate that it was such a moraine. 



Dump-terminal Moraines. — A moraine of this type extended 

 from Blaine south along Georgian Bay to the portage, the 

 Lummi peninsula being the southern end of this moraine. Here 

 boulders do not appear in great numbers on the surface, for reasons 

 which will appear later ; but at all placed where the sea is making 

 inroads into the land along the bay, the beach is strewn with 

 granite and other plutonic "niggerheads." The foot of the glacier 

 was sometimes further out to sea than the present morainic line ; 

 at other times further in on the estuary side. The difl:'erent dump- 

 ing-places left sink-holes between them, which are now kettles or 

 lakes ; Lake Terrel is an example. 



Push-medial Moraines. — A morainic strip of this type, as we 

 have seen, extends from near Sumas City and Abbott's Ford, in Can- 

 ada West, to Boundary bay and Point Roberts. It was the middle 

 ground between the two glaciers just before their final retreat. It 



