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Top Geology Award Goes to Ian Dalziel of The University of Texas at Austin

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A picture of Ian Dalziel at sea

AUSTIN, Texas — Ian W.D. Dalziel, a professor in the Jackson School of Geosciences at The University of Texas at Austin, has been awarded the Geological Society of America’s Penrose Medal for pioneering discoveries about Earth’s ancient geography and its past supercontinents. Established in 1927, the Penrose Medal is widely considered to be geology’s most prestigious career award.

In a letter, GSA Past-President Doug Walker said that Dalziel’s scientific contributions marked a major advance in the science of geology and shed new light on key periods in our planet’s distant past, such as the “Snowball Earth” and the “Cambrian Explosion” of multicellular life.

A globe map showing the supercontinent Gondwanaland filling the western hemisphere with the smaller supercontinent Laurentia filling about a third of the western hemisphere. A blue line indicating a sea channel separates them.
Among the discoveries to have earned UT’s Ian Dalziel the Penrose Medal, was a supercontinental rift half a billion years ago that saw what is now Texas and ancestral North America break away from Gondwanaland, occurring immediately before a huge burst in diversity of life on Earth, known as the Cambrian explosion. Credit: UT Jackson School of Geosciences/Dalziel.

Dalziel’s work has been important in reconstructing the position of our planet’s past continents. His discoveries include evidence that half a billion years ago, during the Cambrian Explosion, Texas lay alongside Antarctica. He also uncovered geology showing that 50 million years later it was part of a large plateau joining ancestral North America to the Andes of Argentina. These and other discoveries spurred a new interest in the geography of our planet from before Pangea, the last time Earth’s landmasses assembled as one, and inspired the idea that other supercontinents had previously existed.

“Ian has certainly earned his place among geology’s scientific giants” said Demian Saffer, director of the University of Texas Institute for Geophysics (UTIG) where Dalziel has worked since 1985. “He is a prolific field scientist whose vision exemplifies the spirit of discovery that is at the heart of UTIG’s mission.”

The award was announced in the July issue of GSA Today.

Dalziel became fascinated with geology at an early age when, as a child, his parents took him on weeks-long treks across the islands and Highlands of Scotland—where he is from. After graduating from the University of Edinburgh with a Ph.D. in geology, Dalziel joined the University of Wisconsin-Madison in 1963, and the Department of Geology and Lamont Doherty Geological (now Earth) Observatory of Columbia University in 1968. His first breakthrough came in 1973 when he visited South Georgia, an inhospitable island about 1,000 miles to the east of Cape Horn. There, he found identical geology to that he had encountered in the southernmost Andes of Chile and Argentina: proof that until at least 100 million years ago, the now distant places were joined, an important idea at the time considering many geologists were still adjusting to the new paradigm of plate tectonics.

The discovery earned Dalziel an honorary membership with the Argentine Geological Association.

“Ian had energy, expertise and willingness to work in places no one had worked before,” said Victor Ramos, who was the association’s president at the time and is now professor emeritus at the University of Buenos Aires. “Most importantly, he worked closely with the scientific community in Chile and Argentina. That way of working was very welcome in South America at the time.”

A picture showing Ian Dalziel standing among snow and rocks with a deployed sensor ahead of him. In the background is a landed Twin Otter aircraft.
Ian Dalziel of The University of Texas at Austin’s Jackson School of Geosciences, who won the Penrose Medal, geology’s highest honor, at Bear Peninsula in West Antarctica in 2000. Credit: Ian Dalziel

Now in his 80s, Dalziel is planning one more visit to the far south Atlantic Ocean, where he and his team will upgrade a bedrock GPS measuring project that helped first raise the alarm about Antarctica’s rapidly melting ice when he established it 35 years ago.

This year’s award is the fifth time that a Penrose Medal has gone to a faculty member or an alumnus of UT’s Jackson School. Past recipients include the legendary oceanographer Maurice “Doc” Ewing (UTIG’s founder), former Jackson School faculty member Robert Folk, Bureau of Economic Geology research scientist Preston Cloud (1976), and Department of Geological Sciences alumnus John Crowell (1995).