ID rocks Flashcards Preview

geos 302 > ID rocks > Flashcards

Flashcards in ID rocks Deck (13)
Loading flashcards...
1
Q

Rock type and Structures

A

Lithic sandstone and pebbly sandstone with crude parallel stratification, typical of resedimented facies on subaqueous portion of fan-delta
succession.

2
Q

ID rock type, ripples, and structures

A

Parallel and cross-
laminated quartz sandstone
with climbing ripples (dashed
lines) and isolated ripples;
brown-coloured layers are fine
grained (muddy) material; tur-
bidite succession, flow to right.
Width of view 20cm.

3
Q

ID rock type, structure, biogenic features

A

Quartz sandstone,
laminated and cross-laminated
(planar tabular cross-sets), with
vertical burrows increasing in
abundance towards top of
section; shallow marine estuar-
ine succession.
Width of view Llm
pliocene

4
Q

ID rock type, structures, erosional planes, other notes

A

Feldspar-rich sandstone
with some bioclastic debris
(white); parallel lamination with
low-angle scour (reactivation
surface, dashed line) and minor
fault (right); shallow-marine
succession, lower foreshore.
Hammer 25cm.
silurian

5
Q

ID rock, structure.

A

8 Lithic muddy sandstone
(lithic greywacke) turbidite bed
(arrow), showing erosive base,
normal grading and standard
Bouma sequence of structures
(as marked A-E).
Width of view 60cm.
Ordovician, Southern Uplands,
Scotland.

6
Q

ID rock

A

Quartz arenite

7
Q

ID rock + features

A

This is a moderately mature arkose, poor sorting.

8
Q

ID rock

A

Clast supported conglomerate. Well rounded pebbles indicate that it formed in a very high energy environment (like a coast)

9
Q

ID rock

A

Weakly laminated black shale indicating laminations.

10
Q

ID structure

A

Dish structures in a thick sand turbidite

11
Q

ID structures/process

A

Post-depositional liquification of laminated turbidite sands that result in fluid-like deformation displacing beds and producing flame structures.

12
Q

ID structures

A
13
Q
A