Description and significance of a fossil earthworm (Oligochaeta: Lumbricidae) cocoon from postglacial sediments in southern Ontario

1979 ◽  
Vol 57 (7) ◽  
pp. 1402-1405 ◽  
Author(s):  
Donald P. Schwert
Keyword(s):  
Lacustrine Sediments ◽  
Southern Ontario ◽  
Fossil Evidence

A nearly complete cocoon of the lumbricid Dendrodrilus rubidus (Savigny, 1826) was isolated from lacustrine sediments of > 10 000 years in age in southern Ontario. The cocoon provides the first fossil evidence for the presence of earthworms in Canada preceding the arrival of European settlers.

Pollen-bearing sediments of the St. Davids buried valley fill at the Whirlpool, Niagara River gorge, Ontario

1970 ◽  
Vol 7 (2) ◽  
pp. 539-542 ◽  
Author(s):  
P. F. Karrow ◽  
J. Terasmae
Keyword(s):  
Water Level ◽  
Lacustrine Sediments ◽  
Lake Ontario ◽  
Southern Ontario ◽  
Niagara River ◽  
Valley Fill ◽  
Lacustrine Deposits ◽  
Late Wisconsinan

Continued studies of the buried St. Davids gorge, an ancient valley of the Niagara River, have indicated that the upper part of this gorge was filled in mid-Wisconsinan time and later. Lacustrine sediments dated at 23 000 years B.P. were deposited in the gorge when the late Wisconsinan ice caused the water level to rise in the Lake Ontario basin by blocking the eastern outlet, prior to over riding the Niagara area. Palynological studies support the correlation of the dated lacustrine deposits in the gorge with the Plum Point Interstade of southern Ontario.

Robert E. Grant's later views on organic development: the Swiney lectures on “Palaeozoology”, 1853–1857

1984 ◽  
Vol 11 (3) ◽  
pp. 395-413 ◽  
Author(s):  
ADRIAN DESMOND
Keyword(s):  
Steady State ◽  
Development Theory ◽  
Fossil Evidence

SUMMARY R. E. Grant's advocacy of transmutation is considered in relation to the scientific climate of the 1850s. To understand the palaeontological framework of his development theory, the unpublished “Palaeozoology” lectures, delivered in 1853–7, are analysed and his sources tabulated. The lectures are shown to contain the following additional themes: (1) a refutation of Lyell's steady-state geology, (2) support for serial development, (3) use of metamorphic effacement to explain the lack of pre-Silurian fossils, and (4) nebular hypothesis. The difficulty of supporting serial development using fossil evidence at this late date is discussed, and this difficulty is deemed to have contributed to the failure of Grant's theory of species “generation”.

The Numerical Analysis of Contaminant Migration from Sanitary Landfill Sites

1977 ◽  
Vol 12 (1) ◽  
pp. 233-255
Author(s):  
J.F. Sykes ◽  
A.J. Crutcher
Keyword(s):  
Contaminant Transport ◽  
Cross Section ◽  
Element Model ◽  
Sanitary Landfill ◽  
Saturated Porous Media ◽  
Two Dimensional ◽  
Contaminant Migration ◽  
Southern Ontario ◽  
Galerkin Finite Element ◽  
Chloride Concentrations

Abstract A two-dimensional Galerkin finite element model for flow and contaminant transport in variably saturated porous media is used to analyze the transport of chlorides from a sanitary landfill located in Southern Ontario. A representative cross-section is selected for the analysis. Predicted chloride concentrations are presented for the cross section at various horizon years.

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