Monmouth And Glamorgan Townships
The nepheline syenite and syenite gneisses of Monmouth and Glamorgan Townships represent the most southwesterly extent of the Ontario nepheline syenite-syenite gneiss belt.
The nepheline syenite and syenite gneisses of Monmouth and Glamorgan Townships represent the most southwesterly extent of the Ontario nepheline syenite-syenite gneiss belt.
The area divides into the Haliburton-Hastings Highland complex of gneisses in the northwest and the Hastings basin of lower grade sedimentary rocks, principally limestones and pelitic schists and gneisses, in the southeast.
The nepheline syenites lying east and northeast of Bancroft in the townships of Dungannon and Monteagle are the most extensive of the southeast Ontario nepheline syenite-syenite gneiss belt. They include the Bancroft nepheline syenite (the East Road occurrence of Currie, 1976a, p.
In the townships of Dungannon and Monteagle a a narrow north- south-trending belt of nepheline gneisses follows the valley of the York River.
Situated mainly in Lyndoch Township, but extending eastwards into Griffith Township, the Wolfe Belt comprises a prominent east-west ridge of southward-dipping nepheline gneiss, nephelinized calc- silicate gneiss and metapyroxenite extending over some 6 km and with a maximum outcrop width of just
Northeastwards the Haliburton-Bancroft nepheline syenite and syenite gneiss belt continues to the Ottawa River but with only small, isolated occurrences of nepheline syenite in Denbigh, South Algoma, Sebastopol, Brougham and Admaston Townships (Hewitt, 1961, p. 102).
The Blue Mountain complex consists of a main mass 4x2.4 km from which extends a southwest-trending arm 6.4 km long and up to 0.4 km wide.
Located on the northern tip of Ellesmere Island, the Cape Richards intrusion is about 7x3 km but it is partly covered by ice, snowfields and scree. It is intruded into schists and marbles of Lower Palaeozoic age, or older.
The Freemans Cove suite consists of five agglomerate vents, about 75 dykes and small plugs, as well as several sills, within an area of 40x20 km at the southeast end of Bathurst Island. It is intrusive into Lower and Middle Devonian and Upper Cretaceous sedimentary rocks.
The Tombstone Batholith comprises two approximately circular intrusions, the larger of which is about 11 km in diameter. It intrudes early Cretaceous orthoquartzites, and grades from alkali syenite at its centre through monzonite and quartz monzonite to quartz diorite near the margins.