Which general plant group dominated land during the early Mesozoic Era? Flowerin

Question

Which general plant group dominated land during the early Mesozoic Era?

Flowering plants

Blue-green algae

Gymnosperms

Spore plants

Global tectonic activity culminated in a continent distribution at the end of the Cretaceous Period that resulted in ______________.

rifting and break-up of Pangaea

accretion of microcontinents to Baltica

collision and suturing of India to Eurasia

subduction of Atlantic Plate beneath the North American plate

3. Fossil evidence of the land-dwelling, mammal-like reptile Lystrosaurus has been found in both Antarctica and Africa, which suggests what for the Triassic Period?

Large-scale continental rifting occurred just prior to the Triassic Period.

Global sea level transgressed and continental land mass was small, isolating these animals.

These areas were connected at that time, allowing populations of Lystrosaurus to spread out.

Global climate conditions cooled, leading to a major ice age.

What evidence along the east coast of North America indicates the breakup of Pangea?

Cretaceous Period mass extinctions

Eocene Epoch adaptive breakthrough of land plants

Triassic Period deep fault-block basins

Ordovician Period thrust-faulted basins

Flowering plants

Blue-green algae

Gymnosperms

Spore plants

Explanation / Answer

1. Gymnosperms dominated land flora for most of the Mesozoic ear until 100 Mya.

2. The Super continent Pangea started breaking apart approximately 175 million years agoo, thus the breaking apart of continent at the end of cretaceous (approx. 65 M.a.) resulted in the drifting apart of continents and collision and suturing of India to Eurasia.

3. Fossil evidence of the land-dwelling, mammal-like reptile Lystrosaurus has been found in both Antarctica and Africa, which suggests these areas were connected at that time, allowing populations of Lystrosaurus to spread out. This is one of the compelling evidences of the existence of the super continent Pangea.

4. Triassic Period deep fault-block basins Ordovician period thrust-faulted basins indicated a shift from a compressional regime, when the continents collided to forma a super continent to an extensional regime, when the continent drifted apart after the breakup.

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.