Alpine Fault Xenoliths

I’m excited about some xenoliths I’ve been looking at from beneath the Alpine Fault… come to my AGU talk to hear more: A few spinel peridotite xenoliths found near the Alpine Fault, New Zealand, exhibit a mylonitic texture and, locally, an extremely...

AGU 2016

Excited about a session I proposed at AGU this fall, New insights on igneous and metamorphic processes from non-traditional thermobarometers and geospeedometers. Co-conveners are Matt Kohn, Jay Thomas, And William Nachlas. Mark Ghiorso is an invited speaker. Consider...

New Website for EAS Master’s program

Happy to have chaired the committee for a new website for the EAS department graduate program! The website has department news, a directory, descriptions of research and classes in the department, FAQ, and opportunities for graduate students. AND it looks great!...

Structural Geology (EAS 227) Field Trip

Some photos from the EAS 227 field trip last week to Catskill, New York Devonian Becraft Limestone comprising mainly grainstone with some greenish shale beds The distinctive brachiopod Gypidula Coeymenensis (pencil for scale in bottom left)  Class...

Mississippi River Commission Maps

I rescued some lovely maps of the Mississippi river from the late 1800’s from the recycling bin a few years ago. I guess the library ran out of room. The maps chart the depth of the river at 100 foot increments. Every 1000 feet or so the surveyors made a...

Grain Size Analysis

Interesting post by Stuart Wright on estimating grains sizes using a weighted area average approach:...
Open-access journals

Open-access journals

Wanted to put in a plug for EGU’s open-access journal Solid Earth. I published a paper there last year on Ti-in-Quartz thermobarometry. It was a good experience, and I’d encourage everyone (particularly senior faculty) to give it a try. Solid Earth had an...
False Pleochroism

False Pleochroism

Got a microscope a few weeks back on ebay, a used Olympus BX51. Generally I’m very happy with it with one exception… under plane polarized light, grains are appear lighter or darker based on orientation and often look a bit iridescent. The image above of an...