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Wanted: Oscar Obsidian - Auckland Museum

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Activity<br />

Sheet<br />

1<br />

2<br />

3<br />

4<br />

5<br />

6<br />

7<br />

ACTIVITY SHEET<br />

ROCK STRATA<br />

Look at this diagram of a cliff face. These are layers of sediment deposited by water. The faster the<br />

water, the larger the particle size deposited, the slower the water, the finer the particle deposited.<br />

Conglomerate<br />

Limestone<br />

Mudstone<br />

Greywacke<br />

Lava flow<br />

· Which is the oldest layer?______________________________________________________<br />

· Which is the youngest layer?____________________________________________________<br />

· What evidence could be used to date layer numbers 2 and 3?<br />

· Why are fossils sometimes found in sedimentary rocks?<br />

____________________________________________________________________________<br />

____________________________________________________________________________<br />

· Sedimentary layers are deposited by water.<br />

What events might have happened when layer 3 was deposited?<br />

____________________________________________________________________________<br />

____________________________________________________________________________<br />

· Write what you think happened as each layer was deposited. Start at layer 7.<br />

____________________________________________________________________________<br />

____________________________________________________________________________<br />

____________________________________________________________________________<br />

____________________________________________________________________________<br />

<strong>Auckland</strong> <strong>Museum</strong> 31<br />

Soil<br />

Sandstone

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