Sedimentary Rocks

Question 1

Quartz Sandstone

Answer 1

Clastic: well sorted, sand sized grains, rounded shape - Main Minerals: quartz – Envirronment: dunes, beach, deserts

Question 2

Oolitic Limestone

Answer 2

Chemical – Main Minerals: Calcite- reacts w/acid – Environment: warm water current precipitates - grains resembling pearls

Question 3

Chert

Answer 3

Chemical – Main Minerals: silical quartz – Environment: rivers or shallow ocean - may break into conchoidal fracture

Question 4

Peat

Answer 4

Biochemical – Main Minerals: plant bits - Environment: swamp or bog

Question 5

Rock Gypsum

Answer 5

Chemical – Main Minerals: gypsum – Environment: desert - can scratch w/fingernail

Question 6

Bituminous Coal

Answer 6

Biochemical – Main minerals: plant bits/carbon – Environment: swamp or bog

Question 7

Shale

Answer 7

Clastic: well sorted, clay sized grains, too small to see shape – Main minerals: clays – Environments: lakes, lagoons, deep oceans

Question 8

Coquina

Answer 8

Biochemical – Main minerals: calcite – reacts w/acid – Environment: coral reef

Question 9

Fossiliferous limestone

Answer 9

Biochemical – Main minerals: calcite – reacts w/acid – warm water reef environment

Question 10

Conglomerate

Answer 10

Clastic: poorly sorted, gravel to clay sized grains, rounded shape – Main Minerals: bits of rock – Environment: alluvial fan or steep river

Question 11

Arkose Sandstone

Answer 11

Clastic: moderate sorting, sand sized grains, sub-angular shape – Main minerals: K-Feldspar, Quartz – Environment: dry

Question 12

Breccia

Answer 12

Clastic: poorly sorted, gravel to clay sized grains, angular shape – Main Minerals: bits of rock – Environment: alluvial fan or steep river

Question 13

Chalk

Answer 13

Biochemical – Main Minerals: Calcite – reacts w/acid – Environment: deep marine