Albay beach reveals ancient ‘pillow lava’

December 1, 2017

 

By Rhaydz B. Barcia


LEGAZPI CITY – The seashore of Mirisbiris beach in Salvacion, Santo Domingo town in Albay holds an ancient geologic formation: the beach is home to ancient pillow lavas, formed millions of years ago.

The formation was discovered by world-renowned geologist Christopher Newhall, after he and his Filipina wife Glenda acquired land in the village.

Newhall said that the pillow lavas were most probably generated through submarine volcano eruption or plate tectonic movement, most probably during the Cretaceous period – some 65 to 100 million years ago, when dinosaurs were still ruling the planet.

“We really don’t know the source of these pillow lavas, if this is [from] beneath the sea, but one thing is for sure: this was shaped during the Cretaceous period or during the Jurassic age,” he said.

Pillow lavas are rock formations of volcanic origin, called such due to its similarity to piles of pillows. The volcanic action takes place under the sea: when a submarine volcano erupts, molten lava is ejected, and the lava rapidly solidifies on the outside due to contact with cold water.

The still-molten lava underneath then ruptures the surface, forming another layer of solidified lava. This process takes place numerous times, and the result looks like a mass of pillows on top of each other.

The pillow lava in Barangay Salvacion probably came from the uplifting of the sea floor due to collision of undersea plates, or from a possible ancient submarine volcano within the Albay Gulf area, Newhall explained.

“The people of this town are unaware of the existence of ancient history that shaped this town,” he said.

From the USGS to Albay

The discovery of the pillow lavas is just a continuation of Newhall’s decades-long work as a geologist, who moved to the Philippines permanently after decades of working with the US Geological Survey and then at the Earth Observatory of Singapore.

Newhall first set foot in the country as a Peace Corps volunteer in 1970, teaching geology at Aquinas University in Legazpi City, before working on the USGS’s Volcano Hazards Team in Seattle as volcanologist in 1980.

He has undergraduate and graduate geology degrees from the University of California, and completed his doctorate at Dartmouth College in 1980. He was also an affiliate professor of earth science at the University of Washington for 17 years.

He has also been helping Philippine government scientists, working with the Philippine Institute of Volcanology and Seismology (Phivolcs) for years, and helping local experts study abroad to specialize on volcanology.

 

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