ks S. Classify the following terrigenous rocks according to whether they are- (a

Question

ks S. Classify the following terrigenous rocks according to whether they are- (a) rudites, (b) arenites, or (c) argillites. Put the letter in he blank. Lithic sandstone Conglomerate with quartz clasts Arkose Gray silty shale Breccia with iron oxide cement Kaolinite 6. Classify the following carbonate rocks according to whether they are tes, (b) calcarenites, or (c) calcilutites. Put the letter in the blank. Intraclastic limestone Chalk Oolitic limestone Coquina Micrite 7. Match the the blank. rock type with the sediment from which it is formed. Put the letter ia a. rounded gravel b. plant fragments c. microscopic skeletons of silica d. feldspar grains e. angular gravel f. sand-sized rock fragments g clay h. lime mud i. broken shells j. coccoliths micrite shale _graywacke -chalk diatomite lignite coquina arkose conglomerate breccia 8. List three allochems you might find in limestone. LAB EXERCISES

Explanation / Answer

5. b- Lithic sandstone, a- Conglomerate with quartz clasts, b- Arkose, c- Gray silty shale, a- Breccia with iron oxide cement, c- Kaolinite

Generally in the sand size classification , rudaceous- grain size is 2 mm or more

arenaceous- sand size varies between 0.625mm and 2 mm

argellaceous- clay sized grains .it is less than 0.0625mm

6. a- Intraclastic limestone, c- Chalk, b- Oolitic limestone, a- Coquina, c- Micrite

This classification is also same as the mentioned above sandstone classification but this is applicable for limestones.

intraclastic limestone- sediments containing fragments of early cemented limestones of intrabasinal origin.

chalk- it is a form of limestone that is composed of calcite.

oolitic limestone- sedimentary rocks formed from ooids(spherical grains composed of concentric layers)

coquina- this kind of sedimentary rock is dominated by transported ,abraded and mechanically sorted fragments of molluscs.

micrite- it is a carbonate of mud grade

7.(h)-micrite

(g)-shale

(f)-graywacke

(c)-diatomite

(j)-chalk

(b)- lignite

(i)-coquina

(d)-arkose

(a)-conglomerate

(e)- breccia

8. allochemical components are the framework particles in mechanically deposited limestones . In Folk limestone classification allochems are often found together with micrite and sparite.

Three allochems are -----(a) ooids,(b) peloids,(c) intraclasts

9. Terrigenous sedimentary rocks are formed or deposited on land. here the following terrigenous sedimentary rocks are ------ graywacke, arkose,red sandstone, intraclastic limestone,quartz conglomerate

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