ROCK FORMATION

The rock units found in the city consist mostly of alluvial deposits and some clastic rocks, which are particularly evident in the eastern side of the city. It also consists of inter-bedded shale and sandstone with occasional thin lenses of limestone, tuff and reworked sandy tuffs, calcareous sandstone and partly tuffaceous shale.

The alluvial deposits, on the other hand, are unconsolidated mixtures of sand, gravel and considerable silt and clay. These are found mostly in the lowlands especially within the periphery of the riverbanks.

GROUND WATER RESOURCES

About 1,720 hectares or 80% of the total land area of Marikina are rated fair for ground water development while the remaining areas (430 hectares) are rated poor. Areas considered poor for ground water development are the eastern portions of the city covering portions of Bgy. Parang and Marikina Heights where the land is mildly sloping.

SOILS

Marikina is characterized by three (3) soils namely Quingua fine sandy loam, the Marikina and the Antipolo clay loam. The Quingua fine sandy loam characterizes the western most section of the city occupying about 602 has. or 28% of the total land area.

The Marikina clay loam makes up the central portion of the city covering 774 has. or 36% of the total land area.

The Antipolo clay loam is predominant in the eastern section of the city. It covers about 36% of the land area or about 774 hectares.


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