If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look?

a. in the section for the Ordovician period of the Paleozoic era.
b. in the section for the Quaternary period of the Cenozoic era.
c. in the section for the Triassic period of the Mesozoic era.
d. in the section for Precambrian time.

After a rock layer is eroded, which additional event must occur to create an unconformity, or a gap in the geologic record?

a. an earthquake or motion along a fault.
b. new deposits of sediment must build up on the eroded area.
c. folding of sedimentary rock layers.
d. a volcanic eruption.

A and A

I need the test lesson 10 unit 4 earth's history unit test

PLEASE HELP ME PLEASE

I disagree with both of your answers.

OK. You're right about 1. I'm not sure about 2.

http://en.wikipedia.org/wiki/Unconformity

1. My lesson says that “many kinds of organisms evolved during the Paleozoic era, including invertebrates, vertebrates, amphibians, and reptiles.”

2. C

2 Is C

For the first question, if you wanted to consult the geologic period for when the first vertebrates evolved, you would look in option a. in the section for the Ordovician period of the Paleozoic era. The Ordovician period, which lasted from approximately 485.4 to 443.8 million years ago, is known for being a time when the first jawless fish and early vertebrates emerged.

For the second question, after a rock layer is eroded, the additional event that must occur to create an unconformity or a gap in the geologic record is option b. New deposits of sediment must build up on the eroded area. This process is known as sedimentation. Over time, sediments from weathering and erosion of existing rocks can accumulate and form new layers on top of the eroded area, creating a gap in the geologic record.

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