Geology (Stratigraphy) Stratigraphy Practical 2 (Term Week Essay

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Geology (Stratigraphy)

STRATIGRAPHY PRACTICAL 2 (Term Week 11)

Match the layers based on the changes in gamma readings

Kezza -1: 75m Fine rounded sands with minor silts

220-327m Quartzofelspathic sands

550-1000m Intermixed fine sands and silts

Kezza -- 2 50-150m Smectite-rich greenish marine clays with minor sands

150-300m Angular medium quartzofelspathic sands

350-600m Medium semi-rounded to angular sands

600-800m (terminal depth) Igneous basement

Kezza -- 3 0-100m Coarse poorly sorted sands; Fine sands and silts

100-400m Smectite and illite shale with some silts and thin fine sand beds

400m 530m Medium moderatel sorted sands with significant feldspar grains

530m 660m Coal; Medium sands

660-1000 Coal; Medium sands, Reefal carbonates; (terminal depth) Igneous basement

Kezza -- 4 0-200m Medium-coarse fluvio-deltaic sands

200-360m Fine sands with minor silt/clay interbeds

360-660m Marine shale with minor sand and silt interbeds

66-800m Medium singular sands

800-950m Coal; Quartzofelspathic sands

950-1246m Coal; Medium semi-round sands; (terminal depth) Felsic intrusives

Kezza -- 5 0-350m Course angular sands; Medium well sorted sands with some silts/clays

350-700m Well-sorted fine medium sands with some silts; Illite-rich claystone

700-1000m Illite claystone; Medium angular quartzofelspathic sands; coal

2.) Suggest why there is a change in gamma radiation within the Kezza rocks

Kezza 1 -- 5 is evidence of increasing meters in layer size of coarse sand, and sand silts.

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Prolonged exposure to gamma rays will create layers of sand and sand silts as evidenced by the Kezza rocks.….....

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