May/June 2022 • Vol. XLIV No. 3 Nature’s Nature |

Elegy

But now I am not I, nor is my house now my house.  — Federico García Lorca When the Chicxulub asteroid impact happened where the Yucatán peninsula wasn’t, a rapidly emplaced high-energy onshore surge deposit, running, rafted, rushed all the way to the southwest corner of North Dakota. There was an arm of sea near the site then, a waterway, Florida far to the south and east and, like the Yucatán, sunk, North America split, unrecognizable as the glass spheres fell postimpact, some preserved in amber, in pine sap. Impact-melt glass had a clear geochemical link to the disaster, trigger of the third-greatest global extinction on Earth. The glass entered fish gills as they breathed, the sudden inundation surges turbulently deposited a sediment package in a hurry overlain with shocked minerals, an iridium anomaly, proof of the extraterrestrial source, and occasionally unaltered impact-melt glass in the compact peach-colored dual-layered tonstein clay bed. Some

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Like Water Flowing

By Elizabeth Arnold

But now I am not I, nor is my house now my house.  — Federico García Lorca When the Chicxulub asteroid impact happened where the Yucatán peninsula wasn’t, a rapidly emplaced […]

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