Geology of Arisaig-Antigonish district, Nova Scotia

Williams, M. Y.

doi:10.2475/ajs.s4-34.201.242

Cited by 1 publication

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“…1) occur below the Silurian and earliest Devonian Arisaig Group of fossiliferous sedimentary rocks. The volcanics appear to occur beneath rocks that are Early Silurian in age (Williams 1914; A. J. Boucot, personal communication).…”

Section: Introductionmentioning

confidence: 95%

“…The contact is irregular, with local conglomerates composed of the uilderlying volcanics. Williams (1914) considered the contact between the Arisaig sediments and volcanics t o be an erosional unconformity representing a long time interval. The minimum geologic age for the volcanics is thus no younger than Early Silurian (Early Llandovery).…”

Section: Arisaig Volcanic Rocksmentioning

confidence: 99%

“…These volcanics are interpreted as being stratigraphically beneath the Silurian Arisaig Group. The geology of the area has been described by Williams (1911Williams ( , 1912Williams ( , 1914.…”

Section: Arisaig Volcanic Rocksmentioning

confidence: 99%

“…The rest of the analyzed samples were collected by P. D. Fullagar during the summer of 1965. All samples were collected at or within I + miles of Arisaig Point (See map 137A in the memoir by Williams, 1914). Sample descriptions are summarized on Table IT.…”

Section: Appendix: Sample Descriptionsmentioning

confidence: 99%

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Radiometric age of the volcanics at Arisaig, Nova Scotia, and the Ordovician–Silurian boundary

Fullagar¹,

Bottino²

1968

Can. J. Earth Sci.

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Volcanics from the Arisaig-Antigonish district of northeastern Nova Scotia underlie fossiliferous Lower Silurian (Lower Llandovery) sediments. The minimum geologic age of the volcanics is Early Silurian, and the maximum geologic age probably is post-Early Ordovician. Twelve whole-rock samples of the volcanic~ were analyzed for rubidium, strontium,and strontium isotopic composition. The best estimate of the age of these twelve samples is 430 t 15 m.y.; this is a maximum age or close to a maximum age for the Ordovician-Silurian boundary. This age plus the authors' results for the Silurian-Devonian boundary indicate that the Silurian Period in northeastern North America may have been shorter than generally has been estimated. Additional Silurian-age volcanlcs are be~ng analyzed.

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Section: Introductionmentioning

confidence: 95%

Section: Arisaig Volcanic Rocksmentioning

confidence: 99%