Abstract
AbstractSpecimens of macroalgae are reported and described herein from newly discovered algal-Lagerstätten within the Llandoverian Earlton Formation at two localities separated by a distance of 45 km in the Timiskaming outlier of Ontario, Canada. Both localities are characterized by abundant specimens of the Codium-like bryopsidalean green alga Thalassocystis striata, the details of which, including within-assemblage morphological variation, compare closely to material from the type locality. Previously, this noncalcified taxon was known only from the Llandoverian Schoolcraft Formation in northern Michigan, ~500 km to the west. These new occurrences provide additional evidence that the alga-bearing intervals within the Earlton Formation at both Timiskaming localities correlate with the Schoolcraft Formation in the Michigan Basin. An associated noncalcified form at one of the Timiskaming localities is described as a new genus and species, Earltonella fredricksi LoDuca, n. gen. n. sp., the thallus architecture of which, with a creeping, runner-like stolon and numerous pinnate fronds, broadly resembles that of the living bryopsidalean alga Caulerpa. In broader terms, these new algal-Lagerstätten indicate that for a brief time during the late Llandoverian, as with other times during the Silurian, unusual conditions conducive to both the proliferation and preservation of expansive ‘seaweed meadows’ were established across regional-scale areas of the Laurentian epeiric sea.
Publisher
Cambridge University Press (CUP)
Reference57 articles.
1. Russell, D.J. , 1984, Paleozoic Geology of the Lake Timiskaming area: Ontario Geological Survey, Preliminary Map P2700, scale 1:50,000. http://www.geologyontario.mndm.gov.on.ca/mndmaccess/mndm_dir.asp?type=pub&id=P2700.
2. Dimorphosiphon rectangulare. Preliminary note on a new Codiacea from the Ordovician of Norway;Høeg;Avhandlinger utgitt av Det Norske Videnskaps-Akademi i Oslo, Matemattikk-Naturvitenskap Klasse,1927
3. A possible hydroid from the Lower and Middle Ordovician of Bohemia
4. Phycological studies—II. New Chlorophyceae, new Rhodophyceae and miscellaneous notes;Howe;Bulletin of the Torrey Botanical Club,1905
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献