SECTIONS OF THE BOWLDER-CLAY. 365 



Section at Negrotown Point. — This section was measured at a distance of 

 about a quarter of a mile west of the Negrotown Point breakwater. In 

 descending order the beds are as follows : 



1. Typical bowlder-clay, unstratified, containing bowlders 2 to 5 feet 

 in diameter, most of them glaciated. The total thickness of this bed is 

 11 feet. 



2. An irregular, wavy, lenticular seam of stratified bowlder-clay, not 

 in horizontal position, and varying in thickness from a few inches to a 

 foot or more. 



3. Bowlder-clay the same as number 1, and containing similar bowl- 

 ders but apparently bedded in some parts. In this division of the bowl- 

 der-clay series the following species of marine shells were found : Yoldia 

 (Ledai) arctica, abundant and well preserved, often with the epidermis 

 on ; Bcln mix crenatus ( fragments), Saximva rugosa, Mya arenaria (a single 

 valve),' Macoma calcarea, Nucula tenuis (much broken), Buccinvm sp. (?), 

 probably undatum (a fragment), etc. All the species except Yoldia are 

 quite rare. They appear to be indiscriminately scattered through the 

 mass. Thickness of this part of the bowlder-clay, 6 to 10 feet. 



4. Stratified, dark red, tough clay, distinctly laminated, with a few 

 bowlders of the same kinds of rocks as those met with in the unstratified 

 portions; the deposit irregular and wavy, not in a horizontal position 

 and somewhat lenticular, or rather not maintaining the same thickness 

 for any distance. Layers of this division of the series are seen sometimes 

 to run up obliquely into and terminate in the unstratified bowlder-clay 

 immediately above, and in other places apparently to graduate into it. 

 Scattered throughout are shells of Yoldia {Leda) arctica, well preserved, 

 often in the bottom with the valves closed and the epidermis intact; 

 Nucula fin a is (broken), Balanus crenatus (fragments), Saxicava rugosa, 

 Macoma calcarea, Buccinum and Mya (fragments), and one or two unde- 

 termined species. Thickness, 4 feet. 



5. The height of the whole bank here being about 45 feet, there still 

 remain 19 or 20 feet of it below the stratified fossiliferous portion, 

 number 4. For the space of some hundred yards both east and west of 

 the section, however, this lower partis concealed from view by landslides. 

 Nevertheless, it is evident that a thick bed of bowlder-claj 7 underlies the 

 stratified seam, number 4 ; whether containing other stratified layers and 

 fossils it is at present impossible to say. No rock outcrops are visible, 

 nor is the bottom of the bowlder-clay in sight anywhere in the vicinity 

 of Negrotown point. The glaciation of Partridge island, which is in 

 Saint John harbor, about a mile distant from Negrotown point, was 

 apparently accomplished by the ice which moved out from the mainland. 

 The ice which produced a portion at least of the bottom bowlder-clay 



