Cephalopod morphology for sedimentologists
Our knowledge of how ammonoids and nautiloids functioned is based almost entirely on a single extant species – the chambered […]
In the field
Gastropod shell morphology for sedimentologists
Some basic gastropod morphology to assist sedimentological interpretations This is a companion post to bivalve shell morphology. The world of
Bivalve morphology for sedimentologists
Some basic bivalve morphology to assist sedimentological interpretations Ok, you’re not a paleontologist but during a sedimentological – stratigraphical examination
Neomorphic textures in thin section
The term neomorphism is reserved for recrystallization of a mineral and its polymorphs to new crystal phases having the same
Stratigraphic surfaces in outcrop – baselevel rise
Outcrop expression of maximum regressive, maximum flooding, and ravinement surfaces Six stratigraphic surfaces define the important boundaries of stratigraphic sequences
Stratigraphic surfaces in outcrop – baselevel fall
Outcrop expression of subaerial unconformities and regressive surfaces of marine erosion Six stratigraphic surfaces define the important boundaries of stratigraphic
Pyroclastic surges and base surges
Pyroclastic surges, are dilute, ground-hugging turbulent flows of hot, juvenile volcanic particles and a fluid phase of superheated steam and
Accretionary aggregates and accretionary lapilli
I have been under the (mistaken) impression that accretionary aggregates, including accretionary lapilli, are occasional odd-ball structures borne of explosive
Block and ash flows
Block and ash flows – a hot pyroclastic flows that transport big chunks of rock Block and ash flows (BAFs)
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