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1)If you found a sedimentary layer with a diverse fossil assemblage

PeriodsRanges of index fossilsCENOZOICQuatemaryHumansPeriodERAL.EPeriodFogopalaCretaceousPeriodMESOZOICERAJurassicPeriod208 -TriassiaPorod248NeuroptorisPermianPerlodSharksRaptiesPennsylvanian323PeriodChonetesPALEOZOIC454-AmphibiansMucrospiriforERADevonianPeriod417-BlurianPeriodStrophomenaOrdavicianPeriodFlandcal many480PlatystrophiaCambiarFlothin540ClonclusPrecambrian-4500FIGURE 8.13 Range zones (black lines) of some well-known index fossils relative to the geologic time scale.136

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