This is the first study of the Upper Jurassic and Lower Cretaceous dinoflagellate cysts of the
Kyuquot Group on Grassy Island, British Columbia. Thirty nine dinoflagellate cyst taxa were
identified in 85 samples collected from the Upper Tithonian Kapoose and Berriasian to Middle
Valanginian One Tree formations. Cyst recovery, concentrations and diversity are relatively high
in the samples from of the Kapoose Formation, whereas samples from One Tree Formation had
poor dinoflagellate cyst recovery. Four dinoflagellate cyst zones were identified. Three cyst
zones (Cometodinium habibii-Endoscrinium campanula-Oligosphaeridium sp.-Pareodinia spp.-
Gonyaulacysta jurassica zone; Cyst Type P zone; and Circulodinium spp.-Cyst Type P zone)
correspond to the Buchia columbiana zone from of the Kapoose Formation and the fourth cyst
zone (Cyst Type D-Cyst Type Q-Circulodinium spp.-Gonyaulacysta spp. zone) is identified from
the One Tree Formation, where four Buchia zones are recognised. The change in the ratio of
marine to terrestrial palynomorphs indicates that the basin went through progressive shallowing
and/or the shore came closer to the site of deposition beginning in the Upper Tithonian and
continuous through to the Valanginian.
The zones resemble established Siberian dinoflagellate cyst zones of the same age. This
correlation suggests that the two regions were a part of the Boreal Realm during the interval. / Graduate
| Identifer | oai:union.ndltd.org:uvic.ca/oai:dspace.library.uvic.ca:1828/3621 |
| Date | 18 October 2011 |
| Creators | Bonnett, Clio J. M. |
| Contributors | Pospelova, Vera |
| Source Sets | University of Victoria |
| Language | English, English |
| Detected Language | English |
| Type | Thesis |
| Rights | Available to the World Wide Web |
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