On March 5, 2020, a televised interview for the network show “Matanglawin” was conducted concerning the Tinipak River and Cave in Barangay Daraitan, Tanay, Rizal. As one of the go-to hiking destinations in CALABARZON, Mr. Byron V. Baldivicio, a geologist from the Mines and Geosciences Bureau Region IV (CALABARZON) discussed the geological characteristics and history of the Tinipak River and Cave.

In the interview, Mr. Baldivicio noted that rocks found in the said river are mostly identified as limestone. Limestone rock formations are primarily composed of calcium carbonate in the form of a mineral called calcite. These rocks were formed underwater from secretions of marine life forms millions of years ago and uplifted due to tectonic processes. It is extensively distributed throughout the Philippines since the climate and environment highly favors its development.

The limestone formations outcrop along Tinipak River and its vicinity are characterized by geomorphological feature called Karst Topography. Such features are caused by the dissolution of carbonaceous rocks when in contact with acidic rainwater which forms caves, caverns and other dissolution features. Mr. Baldivicio mentioned that this process happens naturally through time. He also added that it can also be affected by anthropogenic factors such as excavation which may hasten its formation.

Calcite are usually colorless, transparent or white in color. However, Mr. Baldivicio stated that some calcite deposits contain impurities such as iron (Fe), magnesium (Mg), copper (Cu) that may alter the color of the mineral which causes variance in colors that occurred in limestone formations along Tinipak River.

Photo 1. Ms. Grace Sucgang from Matanglawin during the interview with Geologist II, Mr. Byron Baldivicio.

By: Sheila Mae G. Viterbo                |             5 March 2020