page_title: Caloocan
section_title: Geology
hierarchical_section_title: Caloocan / Geography / Geology
caption_attribution_description: English: Topographic map of North Caloocan
context_page_description: Caloocan, officially the City of Caloocan, is a 1st class highly urbanized city in Metropolitan Manila, Philippines. According to the 2015 census, it has a population of 1,583,978 people making it the fourth-most populous city in the Philippines.
  It is divided into two geographical locations with a total combined area of 5,333.40 hectares. It was formerly part of the Province of Rizal of the Philippines' Southern Luzon Region. It comprises what is known as the CAMANAVA area along with cities Malabon, Navotas and Valenzuela.
  South Caloocan is bordered by Manila, Quezon City, Malabon, Navotas and Valenzuela. Presence of commercial and industrial activities combined with residential areas make it a highly urbanized central business district and a major urban center in the Northern District of Metropolitan Manila. North Caloocan shares its border with Quezon City, Valenzuela and Marilao, Meycauayan and San Jose del Monte in the province of Bulacan. It is composed of mostly residential subdivisions and extensive resettlement areas with scattered distribution of industrial estates mostly within road transit points and intersections.
context_section_description: The geologic formation of the two portions of Caloocan City varies in type and characteristics. and are specifically classified as quaternary alluvium, tuff and tuffaceous sediment, pyroclastic flow deposit, and conglomerates. The formation on the eastern half of Metropolitan Manila extending to the coastline of Manila Bay and including a greater part of South Caloocan, is the quaternary alluvium - consisting of unconsolidated stream‐deposited sediments that includes sand, silt, clay or gravel.
  Eastward of South Caloocan, large areas consisting of tuff and tuffaceous sediment can be traced, spreading towards the whole eastern side of Metropolitan Manila. Pyroclastic flow deposit or igneous rocks formed by the lithification of ash flow are likewise present in northern fringes of South Caloocan and in most parts of North Caloocan. On the northeast borders of North Caloocan, conglomerate rocks were traced, crossing Tala Estate and extending to the province of Bulacan and the La Mesa Watershed.
  Soil found in both areas of Caloocan City predominantly falls under the Novaliches Series, covering 96% of the total land area of the city. The Novaliches Series is composed of reddish brown soil, friable in consistency and granular in structure. Spherical concretions are present in the subsoil and underneath are tuffaceous material of varying degrees of disintegration and weathering. Tuffaceous material is exposed by extensive erosion in some places.
caption: Elevation map of north Caloocan
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