Port St. Mary Ledges & Kallow Point - Port St. Mary, Isle of Man - Places of Geologic Significance on Waymarking.com

The ledges are recognised as one of the best rocky shores in the British Isles for marine ecological studies and are one of only two intertidal limestone ledges still remaining intact on the Isle of Man.

"Geology

The rocks at Kallow Point present useful exposures of the Carboniferous Limestone which in the Isle of Man is limited to the area around Castletown and along the coast between Langness and Port St. Mary.

At Kallow Point itself, near horizontal beds of the Knock Rushen formation consist of thick , fine grained carbonate mud, containing fossils of corals, brachiopods, bryozoa and criniods. The fossilised reamins of animal borrows contribute to evidence that this was once the floor of a tropical sea at a time (350 to 300 million years ago) when the deposits that now make up the Isle of Man were situated near the equator. Ancient ripple marks and over turned brachiopods indicate deposition in a lagoon.

The Knock Rushen Formation is faulted against Manx Group rocks (Ordovician; Manx Group) on both sides of the Kallow Point peninsula and is thus an outlier of Carboniferous rock in the western side of Bay Ny Carrickey. The Formation re-appears on the other side of the Bay slightly to the east of Kentraugh.

An additional feature of interest is the hummocky surface of the limestone below the sea wall, indicating the beginnings of nodule formation. The limestone was extensively quarried for building stone and for supplying limekilns on the site.

The Derbyhaven area has been substantially covered by the recent runway extension. The Scarlett area is subjected to considerably less wave action than Port St Mary Ledges, and so the two areas are complementary as special intertidal sites worthy of protection."

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Waymark is confirmed to be publicly accessible: yes Parking Coordinates: N 54° 04.083 W 004° 44.317 Access fee (In local currency): .00 Requires a high clearance vehicle to visit.: no Requires 4x4 vehicle to visit.: no Public Transport available: no Website reference: [Web Link]

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Date Logged Log User Rating   07/19/2017 monstermunch visited it