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Fortune Head

Coordinates: 47°04′27″N 55°51′26″W / 47.07417°N 55.85722°W / 47.07417; -55.85722
From Simple English Wikipedia, the free encyclopedia
Map of Newfoundland. Reserve is on bottom right-hand side of map, on the long peninsula pointing towards the island of St. Pierre.
Delegates from the Ichnia 2012 conference inspect the Global Boundary Stratotype Section and Point (GSSP) for the Ediacaran-Cambrian boundary at Fortune Head Ecological Reserve. The boundary is defined on the appearance of the complex, vertical trace fossil Treptichnus pedum

Fortune Head is a headland about 1.6 km (0.99 mi) from the town of Fortune on the Burin Peninsula, southeastern Newfoundland.

A 140 m (460 ft) thick section of rock along its cliffs is the Global Boundary Stratotype Section and Point (GSSP). It represents the boundary between the Precambrian era and the Cambrian period, 541 million years ago. Because of its accessibility (easy to get at) and many fossils, Fortune Head was selected in 1992 over similar rock sections in Siberia, Russia, and Meischucum, China.[1]

Ecological Reserve

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Fortune Head was given full ecological reserve status in 1992 after its selection as the global stratotype. The reserve is 2.21 km2 (0.85 sq mi) in size. The Fortune Head lighthouse also acts as a visitors center.[2]

Geology

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The Burin Peninsula is part of the Avalon Zone of the Appalachian Orogen, a late Precambrian episode of mountain-building. The stratigraphy is not uniform throughout the region, however. The sediments were probably deposited in shoreline environments along the former Iapetus Ocean.

The global stratotype at Fortune Head is made up of sandstones, siltstones, and limestones. Some of these rocks have mud cracks and stromatolites, suggesting that deposition occurred in tidal or, at deepest, continental shelf environments.[1]

Fossils

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The boundary between the Precambrian and Cambrian is marked by the presence of trace fossils of Treptichnus pedum, one of the earliest animals. Treptichnus is known only by its distinctive burrow pattern, which can be seen at Fortune Head.

Fortune Head records the beginning of a period of increasing biological diversity known as the "Cambrian explosion". It has a number of other Cambrian and Precambrian fossils, including early shell fossils, vendotaenid algae, soft-bodied megafossils, and microfossils. Below Treptichnus, the stratotype at Fortune Head includes traces of the arthropod Monomorphichnus. More complex fossils appear later.[1]

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References

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  1. ↑ 1.0 1.1 1.2 "Fortune Head Ecological Reserve". Archived from the original on 2007-09-26. Retrieved 2006-03-21.
  2. ↑ "Fortune Head Ecological Reserve". The Government of Newfoundland and Labrador. Archived from the original on 2006-05-18. Retrieved 2006-03-21.

47°04′27″N 55°51′26″W / 47.07417°N 55.85722°W / 47.07417; -55.85722

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