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16 August 2022

Kinked metavolcanics of the Castine Formation, eastern Maine

Callan shares a few outcrops from coastal Maine, part of the Avalonia terrane that accreted to ancestral North America during the Acadian Orogeny. They are volcaniclastic rocks, coarse and fine, and showing both overprinting kink bands and cross-cutting basaltic dikes.

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15 August 2022

Book report

Five books get the Callan mini-review treatment: two novels from Amor Towles, an account of life in prison under solitary confinement, a history of Virginia slavery during the War of 1812, and finally a family account of the discovery of the fossil Hesperornis, a toothed bird, and various associated tangents.

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30 July 2022

Well-preserved mudcracks in Belt argillite, Glacier National Park, Montana

Fresh from the field, Callan shares a quintet of beautifully preserved desiccation cracks in Mesoproterozoic Belt Supergroups sediments, exposed in Montana’s geological gem, Glacier National Park.

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24 June 2022

Friday fold: Kinked Lynchburg metasediments near a soapstone body

Happy Friday! Here are some kink-folded metasediments from Virginia’s Lynchburg Group to help usher in the weekend.

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29 May 2022

Accretionary wedge turbidites from the Lost Coast

The Lost Coast of northern California shows geological evidence of deep sea turbidity current sedimentation, tectonic accretion during Mesozoic subduction, and then isostatic uplift interacting with shoreline erosion. Check out a few photographs taken by Callan’s wife on a recent backpacking trip through the region.

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13 May 2022

Super Volcanoes, by Robin George Andrews

Callan reviews the debut book by volcanologist Robin George Andrews. It details the diverse eruptive histories of Kilauea, Yellowstone, Ol Doinyo Lengai, the oceanic ridge system, our Moon, the planets Mars and Venus, and the cryovolcanoes of the outer solar system moons.

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21 March 2022

Book report

Callan reviews nine books in a big batch – some geoscience, some anthropology, some fiction, some natural history. Something for everyone!

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2 February 2022

Abundance, by Karen Lloyd

Callan reviews a new book about endangered species and ecosystem recovery in various parts of Europe.

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14 January 2022

Book report

Six reviews of recent reads, both fiction and nonfiction, most worth your time.

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12 January 2022

Worlds in Shadow, by Patrick Nunn

Callan reviews a book which sets out to perform a comprehensive accounting of submerged lands through the lens of science, but also with an anthropological emphasis on memory and memory’s longer-lived but more flamboyant cousin, mythology.

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