Also known as LACM localities 6906, 6902, and 3185; Aliso Creek; El Lazo Road

Where: Orange County, California (33.6° N, 117.7° W: paleocoordinates 33.1° N, 114.9° W)

• coordinate stated in text

• local area-level geographic resolution

When: Monterey Formation, Tortonian (11.6 - 7.2 Ma)

• Domning (1978) indicates this collection is latest Miocene-early Pliocene, but Barnes et al., 1985 state it is approximately 10 Ma.

•

•In Southern California the Monterey Formation ranges from the mid Langhian to earliest Messinian (14.9 – 7.1 Ma) [16–18]. Microfossils (diatoms and silicoflagellates) recovered from LACM Loc. 6901, a diatomaceous unit that is stratigraphically below Loc. 6902 [11], are part of the lower Thalassiosira antiqua Subzone a, which ranges from 8.5 to 7.7 Ma [18]. This gives LACM Loc. 6902 an age between 8.5 and 7.1 Ma (late Tortonian–earliest Messinian [19]) (Velez-Juarbe & Valenzuela-Toro, 2019).

•

•This has been clarified by Parham et al 2022 to be late Tortonian

• formation-level stratigraphic resolution

Environment/lithology: basinal (); yellow sandstone and gray shale

Size class: macrofossils

Reposited in the LACM

Collection methods: surface (float),

• Bird fossils described in this paper are LACM specimens and derive from LACM localities previously in Laguna Niguel. Associated with marine mammals.

Primary reference: H. Howard. 1976. A new species of flightless auk from the Miocene of California (Alcidae: Mancallinae). Smithsonian Contributions to Paleobiology 27:141-146 [J. Hunter/J. Hunter/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 13300: authorized by John Hunter, entered by John Hunter on 19.02.2002, edited by Mark Uhen

Creative Commons license: CC BY (attribution)