by Chris Peterson » Sun Sep 04, 2022 8:16 pm
johnnydeep wrote: ↑Sun Sep 04, 2022 8:14 pm
Chris Peterson wrote: ↑Sun Sep 04, 2022 7:13 pm
MarkBour wrote: ↑Sun Sep 04, 2022 6:46 pm
Right. The large one in the foreground, dominating the picture, is one of the volcanic sea stacks.
A typical one, just the closest one in the view.
The large one in the APOD is Cave Rock. I believe that none of these stacks are volcanic, but are Otter Point Formation sandstones.
Huh. Not to be confused with the Otter Sandstone Formation in England -
https://en.wikipedia.org/wiki/Otter_Sandstone_Formation, and here:
https://www.sciencedirect.com/science/article/abs/pii/S0016787814000601 wrote:Abstract
The Triassic succession of the East Devon coastline is a key component of the Jurassic Coast World Heritage Site. Within these strata are the sediments deposited by two major river systems: the Budleigh Salterton Pebble Beds and the Otter Sandstone Formation. The latter are significant as both a reservoir for the Dorset oilfields near Wareham and as a source of significant numbers of vertebrate fossils.
The Otter Sandstone Formation, of Anisian (Middle Triassic) age, has a lower part formed of aeolian sands but these pass upwards into a series of river channel deposits. These river channels, which are best seen between the mouth of the River Otter and Ladram Bay, contain a series of classic features such as erosive channel bases, channel lag deposits, de-watering structures, calcified root systems (rhizoliths), reworked calcretes and (rare) overbank mudstones.
No, not to be confused with that one. Quite different!
[quote=johnnydeep post_id=325595 time=1662322483 user_id=132061]
[quote="Chris Peterson" post_id=325593 time=1662318837 user_id=117706]
[quote=MarkBour post_id=325592 time=1662317176 user_id=141361]
Right. The large one in the foreground, dominating the picture, is one of the volcanic sea stacks.
A typical one, just the closest one in the view.
[/quote]
The large one in the APOD is Cave Rock. I believe that none of these stacks are volcanic, but are Otter Point Formation sandstones.
[/quote]
Huh. Not to be confused with the Otter Sandstone Formation in England - https://en.wikipedia.org/wiki/Otter_Sandstone_Formation, and here:
[quote=https://www.sciencedirect.com/science/article/abs/pii/S0016787814000601][b]Abstract[/b]
The Triassic succession of the East Devon coastline is a key component of the Jurassic Coast World Heritage Site. Within these strata are the sediments deposited by two major river systems: the Budleigh Salterton Pebble Beds and the Otter Sandstone Formation. The latter are significant as both a reservoir for the Dorset oilfields near Wareham and as a source of significant numbers of vertebrate fossils. [b][i]The Otter Sandstone Formation[/i][/b], of Anisian (Middle Triassic) age, has a lower part formed of aeolian sands but these pass upwards into a series of river channel deposits. These river channels, which are best seen between the mouth of the River Otter and Ladram Bay, contain a series of classic features such as erosive channel bases, channel lag deposits, de-watering structures, calcified root systems (rhizoliths), reworked calcretes and (rare) overbank mudstones.[/quote]
[/quote]
No, not to be confused with that one. Quite different!