Northern Samar is home to distinctive rock formations that date back between 15 and 20 million years, according to geologists from the National Committee on Geological Sciences (NCGS).
The Northern Samar provincial government noted in a statement that these results confirm the province's geological significance on a national and worldwide level.
"These volcanic formations, known as Allen Phonolite, date back approximately 20 million years and were uplifted above sea level through tectonic processes," the provincial government said.
Ancient rocks
The famous rock islets of Biri, which may have been formed from old volcanic rocks in the villages of Lavezares and Allen, are highlighted in the study.
According to the provincial government, field research also reveals a number of volcanic eruption relics throughout the Lavezares-Allen-Biri region, with surviving lava flow structures suggesting substantial volcanic activity some 15 million years ago.
Furthermore, Biri Island's geological surveys have revealed uncommon analcime-bearing sandstones and conglomerate discoveries that support the site's prospective UNESCO Global Geopark classification and increase its international scientific importance.
Becoming UNESCO GeoPark
Northern Samar officially submitted an application last year to designate the Biri Rock Formation as a Global Geopark by the United Nations Educational, Scientific, and Cultural Organization (UNESCO). For a preliminary examination, a crew came to the location.
Geologists from the University of the Philippines-National Institute of Geological Sciences, the NCGS, and the central office of the Mines and Geosciences Bureau also assist with the ongoing assessments of the areas.
