Tagasi otsingusse
James et al., 1977
The Oldest Macroborers: Lower Cambrian of Labrador
James, N. P., Kobluk, D. R., Pemberton, S. G.
DOI | 10.1126/science.197.4307.980-a |
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Aasta | 1977 |
Ajakiri | Science |
Köide | 197 |
Number | 4307 |
Leheküljed | 980-983 |
Tüüp | artikkel ajakirjas |
Keel | inglise |
Id | 6534 |
Abstrakt
We have discovered numerous borings of Trypanites penetrating skeletons and synsedimentary cemented limestones in archaeocyathid reefs of the Forteali formation in southern Labrador. These are, to date, the oldest known macroborings. The discover) of these structures extends the record of large endolithic organisms 100 million years from the Lower Ordovician to the Lowver Cambrian. This immediately postdates the appearance of metazoans with hard parts and confirms that endoliths have played a role in reefformation since the early Cambrian.
Viimati muudetud: 24.11.2022