Ignimbrites in outcrop and thin section
Ignimbrite is a rock name. Ignimbrites form primarily from the collapse of eruption columns during explosive volcanism and are included […]
How to do things
Glauconite in thin section
Glauconite – an important stratigraphic and paleoenvironmental indicator Glauconite is one of the most recognizable minerals in the entire sediment
Carbonates in thin section: Forams and sponges
Two important contributors to bioclastic limestones – foram tests and skeletal sponge spicules Foraminifera Foraminifera (forams) are single celled,
Carbonates in thin section: Bryozoans
Bryozoa – are a complex but important group of reef and non-reef invertebrates and contributors to bioclastic sediment. Bryozoa
Carbonates in thin section: Echinoderms and barnacles
Echinoderms and barnacles are important contributors to bioclastic limestones Echinoids are a diverse phylum with a geological history dating back
Carbonates in thin section: Molluscan bioclasts
Molluscan bioclasts are important components of tropical, and cool-temperate water limestones Bioclasts are probably the most important components of Phanerozoic
Volcanics in outcrop: Pyroclastic density currents
This post continues the series on volcanic and volcaniclastic rocks in outcrop, with a brief introduction to pyroclastic density currents
Fluid flow: Froude and Reynolds numbers
19th century experiments that helped quantify the nature of fluid flow, surface waves, and bedforms. It all depends on inertia,
Optical mineralogy: Some terminology
Petrographic (optical, polarizing) microscopes open doors to the architecture of rocks – crystals, grains, cements – a riot of colour
Beach microcosms as fan delta analogues
Natural analogues for full-sized fan deltas Walk any sandy beach at low water, negotiating flotsam, cusps, bedforms, and pools draining