Not sure what it means by bracket age of sandstone and conglomerate. please help

Question

Not sure what it means by bracket age of sandstone and conglomerate. please help with 2

Sketch of a roadside outcrop: ple AO Con Sample B Basalt lava f Sample Sandstone Assume a 50-million-year half life for the radioactive decay of parent to daughter atoms. Sample ID and - Number of daughter[%-jRockage(hy) Number of parent description atoms 625 atoms 9375 Sample A - granite cobble from 2o0 conglomerate from lava flow from dike 01 Sample B - Basalt 100 700 Sample C- Basalt 1000 3000 OD 1. Calculate the ages for the three samples and write these ages in the last column of the table. 2. Bracket age of sandstone and conglomerate.

Explanation / Answer

bracket age means range of ages.

here its is between 150 -200 MY as calculated ages lies between them

so bracket age of sandstone and conglomerate is between 150 -200 MY

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