Applied Stratigraphy — DU B.Sc. (Hons.) Geology Previous Year Question Papers

1. (a) Taking example of a shallow-marine depositional set-up, illustrate the - distinction between Depositional sequence, Genetic stratigraphic sequence' and T-R sequence with a suitable figure. (b) Define 'System Tracts' and their boundaries with suitable figure. 2. Write short notes on: (a) Ravinement surface (b) Paleosol as sequence stratigraphic marker (d) Maximum flooding surface (MFS). 3. (a[) I. What do you understand by `Relative Sea Level (RSL)' in a sedimentary basin ? Considering a passive rmrgin, basin margin and sinusoiinl eustatic / curve, discuss with suitable diagrapn how relative sea level wfll vary. (Z>) What i¥s `Accommodation'.in a sedimentary ba`sin? What d6 you understand by physical accommodation and ecological accommodation ? 4. (ab) With a stiitable figure explain the formation of unconformity., Basal surface of-forced regressich (BSFR), Regressive surface Of `marine erosion (RSRE) and Correlative Conformity (CC). (ZI) At whait specific condition forced regression will result in fluvial aggradation ? 5. (ai) What would ,be tie stratal packaging pattern and nature of facies belt i.f: (i) Rate of sedinentation > Rate Of relative sea. level, rise ? (ZZ) Rate of relative. sea level rise > Rate of sedinentation ? (a) Defroe' meteoric exposure unconformity and Drowning unconformity in a carbonate depositional system. (b) How Strontium (Sr) isotopes help in stratigraphic correlation of marine strata ? 7. (a) Taking examples of Aggrading reefs, Compound reefs, Progradational reefs and Retrogradational reefs, discuss relationship between accommodation generation and carbonate production, in particular reef growth. (b) Define meteoric exposure unconformity and Drowning unconformity in a carbonate system. 8. (a) "By correlating the polarity reversal pattern retrieved in a rock succession to a reference geomagnetic polarity time scale (GPTS), calibrated by radioisotopic methods and/or orbital tuning, the age of the rock succession can be derived." Explain the statement. with example. (b) How does a fluxgate magnetometer work ? -