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The crater area is covered by younger lavas and eruptives. The Þjórsá lava does not appear on the surface until 70 km downstream of its supposed crater area. In the lowlands the lava has overflown wide areas, covering the districts Landsveit, Gnúpverjahreppur, Skeið and Flói. — “Þjórsá lava - Wikipedia, the free encyclopedia”, en.wikipedia.org
He was distinguished for his researches on extrusive rocks, their microscopic structure and origin; and he employed the polarizing microscope early on for the determination of minerals. He wrote Structures et classification des roches éruptives (1889), but his more elaborate studies were. — “Auguste Michel-Lévy - Wikipedia, the free encyclopedia”, en.wikipedia.org
In 1877 he became professor of natural history at the Collège de France, in Paris, and in 1881 he was elected a member of the Academy of Sciences. His chief publications were: Santorin et ses eruptions, 1879; (with Michel-Lévy) Minéralogie micrographique, Roches éruptives françaises (2 vols. — “Ferdinand André Fouqué - Wikipedia, the free encyclopedia”, en.wikipedia.org