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Archive Classic: The Mystery of the Ultra-Pure Sandstones

Reprinted from June 27, 2003, this mystery is worth considering still. What caused these global deposits that are not being formed today? R. H. Dott, Jr (Univ. of Wisconsin) has a problem. He’s been trying to explain a geological puzzle for 50 years, and it is still unresolved.

Aussie Dino Stampede Tramples Long Ages

Researchers just published findings on a decade-long study of one of the biggest dinosaur trackways on earth, located on the west coast of Australia.

Geology Theories Are Not Set in Stone

To be a geologist, you have to have a big imagination and always be ready to have your favorite theory overturned.

Crinoid Pigment: 240 Million Years and No Evolution

Pigments from crinoids fossilized in early Mesozoic strata are identical to modern counterparts.

Densely-Packed Dinosaur Raptor Bones Found

A stunning matrix of densely-packed bones from multiple carnivorous dinosaurs has been found in a big block of Utah sandstone.

Earth as a Habitable Planet

When viewed as a planet among planets, Earth is surprisingly surprising, considering how close it is to scientists' investigating eyes.

Navajo Sandstone Dates Are Incoherent

Can concretions really be 190 million years younger than the rock in which they are embedded?

Dinosaur Soft Tissue "Explained"

The discoverer of soft tissue in dinosaur bone now has a new explanation for its preservation – but does it really answer the obvious question?
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