Use the data you've recorded from the previous activity to arrange the rock layers from oldest to youngest on the geologic time scale. Determine the identity of the unknown fossil by using the Fossils chart.

TOOLS

Paleozoic Era

433 417

359

542

490

299

250

+

+

million

years ago

Basalt

Limestone with

unknown fossil

Cambrian

Ordovician

Silurian

Devonian

Carboniferous

Permian

Sandstone with

trilobite

Shale with

ammonite

Che

Cambrian is 542

Ordovician is 490 to 433

Devonian is 417 to 359

Permian is 299 to 250

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lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

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