- The Quaternary (/kwəˈtɜːrnəri, ˈkwɒtərnɛri/ kwə-TUR-nə-ree, KWOT-ər-nerr-ee) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.58 million years ago to the present. As of 2023, the Quaternary Period is divided into two epochs: the Pleistocene (2.58 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today); a third epoch, the Anthropocene, has recently been proposed, but it is not officially recognised by the ICS.
- Seattle Neighborhoods: Loyal Heights, Sunset Hill, and Shilshole — Thumbnail History (historylink.org)
The Loyal Heights neighborhood began in 1890 as a bedroom suburb of the town of Ballard and continues the same role in the northwestern corner of contemporary Seattle. The area is situated above NW 65th Street, well north of Ballard’s primary commercial district. The shores of Puget Sound and 15th Avenue NW define its western and eastern boundaries, and the former city limits at NW 85th Street define its northern extension. Loyal Heights owes its name and a large part of its existence to a migrant mid-westerner, Harry W. Treat (1865-1922), who developed and promoted a large tract of land above NW 75th Street, beginning in 1906.