The Alvarez and the Crater of Doom
History of Geology
by David Bressan
3y ago
"It was nothing of this earth, but a piece of the great outside; and as such dowered with outside properties and obedient to outside laws." "The Colour Out of Space", by H.P. Lovecraft (1927) Until 50 years ago it seemed that a characteristic peculiarity of the Cretaceous-Palaeogene (or K–Pg) ) transition, famous for the mass extinction event that "killed" off the dinosaurs, was the apparent lack of a complete stratigraphic record. However, in the decade 1960-1970 the American geologist Walter Alvarez discovered a homogeneous and complete succession of bedded limestone- and marl-layers in the ..read more
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Artist M.C. Escher and his Crystal-inspired Artwork
History of Geology
by David Bressan
5y ago
“There is something breathtaking about the basic laws of crystals. They are in no sense a discovery of the human mind; they just “are” – they exist quite independently of us. The most that man can do is become aware, in a moment of clarity, that they are there, and take them into account. Long before there were people on the earth, crystals were already growing in the earth's crust. On one day or another, a human being first came across such a sparkling morsel of regularity lying on the ground or hit one with his stone tool and it broke off and fell at his feet, and he picked it up and regarde ..read more
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Geology and the Genoa bridge collapse
History of Geology
by David Bressan
6y ago
In Genoa, part of the important A10-highway bridge 'Polcevera' (locally known as 'Morandi', so named after the engineer who planned the bridge) collapsed Tuesday during a thunderstorm. Today 39 victims are confirmed, 16 survivors were saved from the debris, 9 are severely injured, and 10-20 people are still reported missing.The bridge was built between 1963 and 1967 and planned by Italian engineer Riccardo Morandi, who planned bridges also in Venezuela and Lybia. 1964 newspaper issue. At this time the cause of the collapse is unclear. Speculations range from thunderstorm damage, material fatig ..read more
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