Absolute Dating of the Middle Ordovician
β Scribed by ADAMS, J. A. S.; OSMOND, J. K.; EDWARDS, G.; HENLE, W.
- Book ID
- 109612956
- Publisher
- Nature Publishing Group
- Year
- 1960
- Tongue
- English
- Weight
- 317 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0028-0836
- DOI
- 10.1038/188636a0
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Graptolite assemblages of multidens Biozone age have been recovered from mudstones immediately above and below the Llyn Conwy Formation, the local representative of the regionally extensive acid tuffs that mark the end of vulcanicity in the south and east of the Harlech Dome. They include several ta
## Abstract Ordovician graptolite faunas of Peru are restricted to a short interval in the Middle to basal Upper Ordovician, found in three regions of the country. All Peruvian graptolite faunas are strongly dominated by shallow water elements of the Atlantic Faunal Realm, represented largely by __