Field Notes from the Deep Crust

A living record of tremolite, tectonics, and what the rock is actually telling us.

Tremoloid publishes long-form field notes, lab observations, and mineralogical essays from working geologists, mineralogists, and backcountry survey crews. Slow reading. Honest data. No press releases.

Read the journal About the project
Vol. IV · Issue 12 Updated this week 142 field notes archived

Project at a glance

142
Field notes
37
Contributors
19
Active localities
8
Topic threads
Featured Field Note

A first-of-the-season visit to a long-quiet lens in the Grenville metasediments. We came back with twenty-two samples, a revised strike measurement, and a small argument about whether the host calcite is recrystallized or just tired.

HM
Helena Markström Mineralogist · 14 min read · Published Mar 14
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Topics

Follow a thread. Each topic is curated, never algorithmic.

Browse our eight working threads — from contact-metamorphic mineralogy to field-logistics essays. Every article lives in exactly one topic, and the table of contents is human-edited.

Tremolite & Amphiboles 34 notes Tectonics & Structure 28 notes Field Methods 22 notes Petrography & Thin Sections 19 notes Geochemistry 15 notes History of the Trade 11 notes Microscopy & Optics 8 notes Field Equipment 5 notes
Latest Dispatches

What the crew filed this month.

Six recent notes from the journal — long enough to earn their place, short enough to finish in a sitting. We post one to two a week, never on a schedule we can't keep.

Mar 22Tremolite & Amphiboles

Where tremolite ends and actinolite begins: a working line for the field lens.

A practical rule of thumb for the 10× loupe, with three counter-examples from this season's traverses.

9 minHelena MarkströmField Methods
Mar 19Tectonics

Notes from the brittle-ductile transition, with a tape measure and a thermos.

Why the classic cartoon of a single sharp boundary keeps failing us in the metasediments of the southern shelf.

16 minDaichi OhiraTectonics
Mar 16Petrography

Reading tremolite's second-order birefringence without losing your place at the scope.

A small set of habits that have saved me a lot of slide time over the years, with a checklist at the end.

11 minPriya AnandMicroscopy
Mar 11History

What the 1893 Tremolite Mining Company annual report actually says — and what it skips.

Reading an old report against the modern mine plan is a humbling exercise. Here are the four passages that matter most.

13 minMargit VossHistory
Mar 14Field Note

Cleavage planes, cold hands: three days at the Calumet tremolite outcrop.

First-of-the-season visit to a long-quiet lens in the Grenville metasediments, with samples and a small argument.

14 minHelena MarkströmField Methods
See all 142 dispatches
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We accept long-form essays, lab write-ups, locality reports, and short photo-driven notes. Our editors reply to every submission within ten days, and we publish at our own pace, not yours.

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  • Long-form field notes from working geologists and survey crews
  • Lab write-ups, microprobe data, and thin-section studies
  • Locality histories, archival re-readings, and translated sources
  • Short photo notes — one rock, one observation, no preamble

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