Incapillo is a Pleistocene-age caldera – a depression formed by the collapse of a volcano – in La Rioja Province, Argentina. It is part of the southernmost volcanic centre in the Andean Central Volcanic Zone (CVZ). Subduction of the Nazca Plate beneath the South American Plate is responsible for most of the volcanism in the CVZ. Volcanism commenced in the Incapillo region 6.5 million years ago, forming the high volcanic edifices of Monte Pissis, Cerro Bonete Chico and Sierra de Veladero. Incapillo is known to have erupted the Incapillo ignimbrite 0.52 ± 0.03 and 0.51 ± 0.04 million years ago; this has a total volume of about 20.4 cubic kilometres (4.9 cu mi). A caldera with dimensions of 5 by 6 kilometres (3.1 mi × 3.7 mi) formed during the eruptions. Later volcanism generated more lava domes within the caldera and a debris flow in the Sierra de Veladero. The lake within the caldera may overlie an area of ongoing hydrothermal activity..

Read more: https://en.wikipedia.org/wiki/Hydrothermal_circulation

_______________________________ Today's selected anniversaries:

1864:

Union general Ulysses S. Grant pulled his troops out of the Battle of Cold Harbor in Hanover County, Virginia, ending one of the bloodiest, most lopsided battles in the American Civil War. https://en.wikipedia.org/wiki/Battle_of_Cold_Harbor

1914:

As part of the Ottoman Empire's policies of ethnic cleansing, Turkish irregulars began a six-day massacre in the predominantly Greek town of Phocaea. https://en.wikipedia.org/wiki/Massacre_of_Phocaea

1954:

Dominic Savio, who was 14 years old at his death in 1857, was canonized by Pope Pius XII, making him one of the youngest non-martyred saints in the Catholic Church. https://en.wikipedia.org/wiki/Dominic_Savio

1994:

The Boeing 777, the world's largest twinjet, made its maiden flight. https://en.wikipedia.org/wiki/Boeing_777

_____________________________ Wiktionary's word of the day:

tin-pot dictator: (derogatory) An autocratic ruler with little political credibility, typically having delusions of grandeur. https://en.wiktionary.org/wiki/tin-pot_dictator

___________________________ Wikiquote quote of the day:

Hold on yet awhile. More ways of killing a cat than choking her with cream.   --Charles Kingsley https://en.wikiquote.org/wiki/Charles_Kingsley