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While living on Flores, he identified dozens of archeological sites and conducted excavations at many of these, including the now famous site of Liang Bua where the "hobbits" of human evolution were discovered ( from Java was likely behind making the stone tools found on Flores and may have reached the island around 750,000 years ago.

At the time, paleoanthropologists took little notice of Verhoeven's claims or if they did, they discounted them outright.

Almost thirty years later, an Indonesian-Dutch research team uncovered evidence at the Soa Basin which confirmed Verhoeven's original findings.

This team even went further by dating some of the stone tools and fossils using paleomagnetism (a method of determining the age of ancient sediments) and showed they were probably around 700,000 years old.

Terrestrial planets have hard surfaces that can be re-shaped by several different processes: impact cratering, volcanism, erosion, and tectonics.

The new study dated layers of volcanic ash and calcite directly above and below the fossils. Flores is one of many Wallacean islands, which lie east of Wallace's Line and west of Lydekker's Line. Unlike people, you can’t really guess the age of a rock from looking at it.Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.The craters on all of the moons except Io, Mercury, and most of the ones on Mars are from impacts.The kinetic energy of the impacting meteorite or asteroid is converted into heat, sound, and mechanical energy---the projectile explodes on impact.

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