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News: Ancient Volcanic Rocks Found in Northern Samar Reveal 20 Million Years of History

 📍 Biri, Northern Samar | Philippine News Agency (2023)


In the rugged coastlines of Biri Island, Northern Samar, geologists from the National Committee on Geological Sciences (NCGS) have confirmed the presence of volcanic rock formations that date back approximately 15 to 20 million years. These findings were reported in a March 27, 2025 article by the Philippine News Agency. 


The formations, identified as part of the Allen Phonolite volcanic complex, were originally formed under the sea, then uplifted by tectonic forces. Volcanic activity in the adjacent Lavezares-Allen-Biri area left preserved lava flow structures. Researchers also discovered analcime-bearing sandstones and conglomerate layers, rare geological features that increase the site’s scientific value. 


It isn’t just the age of the rocks that draws attention but the unique shapes carved over centuries by waves, wind, and weathering. There are seven major rock formations on Biri, named Magasang, Magsapad, Macadlaw, Puhunan, Bel-at, Caranas, and Pinanahawan. Some of them serve as natural breakwaters against the strong waves of the Philippine Sea and the San Bernardino Strait. 


Because of their geological, ecological, cultural, and aesthetic significance, local and national agencies are pushing for further protection. The Department of Environment and Natural Resources (DENR) supports declaring Biri Rock Formations as a UNESCO Global Geopark. It’s already a protected area under RA 11038 as part of the Biri Larosa Protected Landscape and Seascape. 


Why this matters:

  • Scientific significance: These rocks offer insight into volcanic activity millions of years ago, undersea formation, and uplift.
  • Cultural & community value: Rich in natural beauty, the formations are tourist magnets, inspiring local livelihoods.
  • Conservation: Being declared a geopark increases protection, awareness, and sustainable tourism.

📚 Source: Philippine News Agency. (2023). Geologists find 15–20-million-yr-old rock formations in N. Samar.



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