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Answer:
Scientists can infer that the plant existed sometime from 400 million to 230 million years ago
The age of plant fossil is lower than 400 million-year but higher than 230 million-year.
Age of plant fossil
The age of plant fossil occurs between 230 million-year and 400 million-year because the layer in which plant fossil comes between 230 and 400 million-year. The age of that plant fossil is lower than 400 million-year old Phacops fossils due to its presence above the layer.
While on the other hand, the age of plant fossil is higher than 230 million-year due to its occurrence below the layer of 230 million-year old Tropites fossils so we can conclude that the age of plant fossil is lower than 400 million-year but higher than 230 million-year.
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