Simple, we weren't around during that time, so we made theories and conclusions to when life evolved on earth.
Explosive eruptions tend to build up composite volcanoes.
A composite volcano evolved over tens of thousands of years as a result of several eruptions. The composite volcano is built up through eruptions, layer by layer, until it reaches heights of thousands of meters. Lava may have formed some layers, while ash, rock, and pyroclastic flows may have formed others. A composite volcano can also accumulate significant amounts of thick magma, which can clog up inside the volcano and force it to erupt violently.
Composite Volcano are fueled by a conduit system that accesses a magma reserve deep within the Earth. This magma can erupt either from a sizable core crater at the volcano's summit or from a number of vents scattered throughout the flanks of the composite volcano.
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Answer:
The davis's geomorphic cyclic theory raised some of the problems that the davis's concept of the upliftment creates problem so that is why it is unacceptable as it basically described the rapid change in the rate of the upliftment in the very short duration.
And the concept of the correlation in the upliftment and erosion are erroneous as, according to the concept no erosion occurred unless the upliftment process are completed.
