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The summit of Red Hill was the meeting point of three 1840s Mexican land grants: Rancho Canada de Herrera, Rancho Punta de Quintin, Corte de Madera, la Laguna y Canada, and Rancho Las Gallinas Punta de San Pedro y Santa Margarita. On early maps, Red Hill is called Sugar Loaf. Red Hill is 464 feet high. It is pillow basalt rock formed from submarine volcanic activity. Exposed pillow basalt weathers in time to red causing the red soil.