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Abbotts Lagoon
Abbotts Lagoon is a two-stage lagoon on the northwestern coast of the Point Reyes National Seashore, southwest of Tomales Point. The upper lagoon is a fresh water impoundment which overflows into a lower brackish level with occasional winter tidal exchange.〔(【引用サイトリンク】title=Abbotts Lagoon )〕 The eastern shore of the lagoon is covered with old growth northern coastal scrub including coyote bush, yellow bush lupine, sword fern and California blackberry.〔Stallcup, Rich & Pitkin, Melissa ''Discovering Birds at Point Reyes'' (2007) Point Reyes National Seashore Association ISBN 0-9607890-6-5 pp.35-37〕
==Geology==
Abbotts Lagoon is usually separated from the Pacific Ocean by dune sand to the west. The eastern side of the lagoon is bordered by Miocene marine sediments to the north and Pliocene marine sediments to the south from sedimentary rock formations on the western side of the San Andreas Fault.〔Koenig, James B. ''Geologic Map of California:Santa Rosa Sheet'' (1976) State of California Resources Agency〕 Santa Margarita Sandstone atop the Monterey Formation forms a ridge along the southern side of the valley containing the upper lagoon, and is exposed along the eastern shoreline of the lower lagoon.〔(【引用サイトリンク】title=Geology at Point Reyes National Seashore and Vicinity, California )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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