Block and ash flows
Block and ash flows – a hot pyroclastic flows that transport big chunks of rock Block and ash flows (BAFs) […]
Interpreting ancient environments
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
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,
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