EarthCastings is a personal newsletter by a Boulder geologist blending field-based geology with wider reflections on science and history. Readers get long, carefully explained essays on features like the Grand Canyon's Great Unconformity, planetary change over US history, and campus figures from the University of Colorado.

Field notes, tools and research reports on the natural world, including a volcano guessing game, a review of research on nature and wellbeing, and a conservation proposal for a sandplain habitat. Readers get original projects and well-sourced, practical writing on ecology and human connection to nature.

A narrative nature series, currently themed on natural world mysteries, that places the reader in the role of historical scientists and prospectors. Each issue tells the story of a puzzle in biology, zoology or geology, such as the sailing stones of Death Valley or the lost nesting grounds of the Kemp's ridley turtle.

A serialized literary thriller newsletter that pairs fictional field-journal dispatches with real archaeology, geology and natural phenomena, such as the Delphi oracle's gas vents, Mesopotamian demon tablets and the Hessdalen lights. Readers get well-researched historical and scientific background framed as narrative nonfiction.