Payún Matrú is a shield volcano in the Malargüe Department of Mendoza Province, Argentina. Activity in its volcanic field commenced at least 2.5 million years ago and continued until about 515 years ago. Payún Matrú lies in the Payenia volcanic province in the back-arc region of the Andean Volcanic Belt, formed by the subduction of the Nazca Plate beneath the South American Plate. The volcano developed over sediments and volcanic rocks ranging from Mesoproterozoic to Tertiary age. It consists of a large shield volcano capped off by a 7–8 km (4.3–5.0 mi) caldera that formed during a large explosive eruption between 168,000 and 82,000 years ago, along with a compound volcano 3,680–3,797 m (12,073–12,457 ft) high, and scoria cones and lava flows due west and east from the main shield volcano. One of these lava flows, the Pleistocene Pampas Onduladas flow, is the longest one in the world from the Quaternary, at 167–181 km (104–112 mi).

Read more: https://en.wikipedia.org/wiki/Pay%C3%BAn_Matr%C3%BA

_______________________________ Today's selected anniversaries:

1848:

London Waterloo station, Britain's busiest railway station by passenger usage, was opened by the London and South Western Railway. https://en.wikipedia.org/wiki/London_Waterloo_station

1914:

USS Nevada, the United States Navy's first "super- dreadnought", was launched. https://en.wikipedia.org/wiki/USS_Nevada_%28BB-36%29

1960:

To Kill a Mockingbird, a novel by Harper Lee featuring themes of racial injustice and the loss of innocence in the Deep South of America, was published. https://en.wikipedia.org/wiki/To_Kill_a_Mockingbird

2010:

The Islamist militia group Al-Shabaab carried out multiple suicide bombings in Kampala, Uganda, killing 74 people and injuring 85 others. https://en.wikipedia.org/wiki/July_2010_Kampala_attacks

_____________________________ Wiktionary's word of the day:

athanor: (historical) A furnace or stove designed and used to maintain uniform heat, primarily used by alchemists. https://en.wiktionary.org/wiki/athanor

___________________________ Wikiquote quote of the day:

Folks don’t like to have somebody around knowin’ more than they do. It aggravates ‘em. You’re not gonna change any of them by talkin’ right, they’ve got to want to learn themselves, and when they don’t want to learn there’s nothing you can do but keep your mouth shut or talk their language.   --To Kill a Mockingbird https://en.wikiquote.orghttps://en.wikipedia.org/wiki/To_Kill_a_Mockingbird_%28novel%29