Backyard DigBackyard Dig

By Tara, Anita, Sarah,and Jami

By Tara, Anita, Sarah,and Jami

Rock LayersRock Layers

Cenozoic

Mesozoic

Paleozoic

Precambrian

FossilsFossils

Trilobites, Paleozoic

Shark, Mesozoic

Snapping turtle, Cenozoic

AnalysisAnalysis

• The oldest rock layer is Precambrian, because according to the law of superposition, the oldest rocks are at the bottom, and the Precambrian is at the bottom.

• The youngest rock layer is the Cenozoic, because according to the law of superposition, the youngest rocks are at the top, and the Cenozoic is at the top.

• The oldest rock layer is Precambrian, because according to the law of superposition, the oldest rocks are at the bottom, and the Precambrian is at the bottom.

• The youngest rock layer is the Cenozoic, because according to the law of superposition, the youngest rocks are at the top, and the Cenozoic is at the top.

AnalysisAnalysis

• No fossils were never alive, because the mold and the cast are not actually alive. They just look like the organism/object that is fossilized into it.

• There are two parts of a fossil. One part is the cast and the other is the mold. The cast part is the part that looks like the organism/object. The mold part is the part that looks like the imprint.

• No fossils were never alive, because the mold and the cast are not actually alive. They just look like the organism/object that is fossilized into it.

• There are two parts of a fossil. One part is the cast and the other is the mold. The cast part is the part that looks like the organism/object. The mold part is the part that looks like the imprint.

AnalysisAnalysis

We know that our backyard was probably really old because we found fossils and rocks from the Precambrian era, Paleozoic era, Mesozoic era, and the Cenozoic era.

We know that our backyard was probably really old because we found fossils and rocks from the Precambrian era, Paleozoic era, Mesozoic era, and the Cenozoic era.