Old Earth Ministries Earth History Curriculum Test 5
Earth History Test 5


Please choose the correct answer for each question below. There are 15 questions. You cannot save your progress and come back later to complete the test, therefore you must complete the test during one session. Please enter your name, a single character in the email field, and the number 1 in the Student ID field, and take the quiz.
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1: The Silurian Period started how many million years ago? (Hint:: there is a decimal point)

2: In terms of duration, the Silurian is the shortest of the geologic periods.
True
False
3: 3. Graptolites are a common fossil in Silurian age rocks. The period is divided into four parts, based on the appearance of a certain species of graptolite. This makes graptolites useful in biostratigraphy.
True
False
4: Graptolites are solitary animals, as opposed to corals, which are colonial animals.
True
False
5: The Silurian Period is followed by the ______________ Period.

6: The Silurian Period ended....
443 Ma (million years ago)
425 Ma
416 Ma
400 Ma
7: Which organism had symmetrical shells?
Brachiopods
Bivalves
8: Which organism is strictly marine (living only in the ocean)?
Brachiopods
Bivalves
9: There are over 12,000 species of Brachiopods recognized in the fossil record.
True
False
10: By comparison, there are about _________ species of bivalves.
7,000
30,000
47,000
15,000
11: In bivalves, the two valves are on the left and right sides, whereas in brachiopods, the two valves are on the dorsal and ventral surfaces.
True
False
12: Which animal has a siphon?
Brachiopods
Bivalves
13: 13. This coral is an extinct order, whose name refers to its shape (also known as horn corals), and were dominant by the middle Silurian, and became extinct in the Triassic.
Tabulate Corals
Rugose Corals
Scleractinian Corals
Pillar Corals
14: 14. This type of extinct coral was always colonial, forming colonies of individual hexagonal cells known as corallites. Their distinguishing feature is their well-developed horizontal internal partitions within each cell, but reduced or absent vertical internal partitions (septae).
Tabulate Corals
Rugose Corals
Scleractinian Corals
Pillar Corals
15: A coral "head" is formed from many individual but genetically identical ______________.


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