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Posted by: Antdoghalo Apr 24 2021, 02:28 AM

About a week ago, I was looking at the Mangala Valles and following what appeared to be a smaller channel upstream when I noticed this oblong crater with radial features. At first I thought not much of it, but a look at the topography of the upper Mangala Valles showed this crater was located on a broad topographic rise. Looking at THEMIS imagery, I noticed this looked a lot like an old shield volcano at 27 South and 149 West, sporting a caldera 7 by 15 miles and about 140 miles in diameter. For Mars standards, it is one of a kind. There's the giant shields of Tharsis and Elysium, the small shields, the ancient broad edifices of Alba, Syrtis, and Hellas, as well as the ancient stratocones in the southern hemisphere. This has the broad slopes of Alba Mons, the size of Apollinaris, the age of Tyrrhena, and the caldera of Uranius Tholus. While it could just be a welt on the crust caused by magma or deformation, the radial lava flow-like structures suggest a volcanic origin.

Is there any articles on this medium-sized shield edifice? I searched and only found articles on the volcanic mounds to the south and the Daedalia lava plains to the east.

Posted by: OWW May 7 2021, 06:52 PM

In https://www.uahirise.org/ESP_066442_1530 from late 2020 it's called 'Possible Volcanic Caldera in Terra Sirenum'.

Posted by: Antdoghalo May 11 2021, 02:35 PM

QUOTE (OWW @ May 7 2021, 02:52 PM)