- journal_title：The Journal of Foraminiferal Research
- Contributor：Andrew C. Kemp ; Simon E. Engelhart ; Stephen J. Culver ; Alan Nelson ; Richard W. Briggs ; Peter J. Haeussler
- Publisher：Cushman Foundation for Foraminiferal Research
- Date：2013-01-01
- Format：text/html
- Language：en
- Identifier：10.2113/gsjfr.43.1.88
- journal_abbrev：Journal of Foraminiferal Research
- issn：0096-1191
- volume：43
- issue：1
- firstpage：88
We describe the modern distribution of salt-marsh and tidal-flat foraminifera from Sitkinak Island (Trinity Islands) and Simeonof Island (Shumagin Islands), Alaska, to begin development of a dataset for later use in reconstructing relative sea-level changes caused by great earthquakes along the Alaska-Aleutian subduction zone. Dead foraminifera were enumerated from a total of 58 surface-sediment samples collected along three intertidal transects around a coastal lagoon on Sitkinak Island and two intertidal transects on Simeonof Island. Two distinctive assemblages of salt-marsh foraminifera were recognized on Sitkinak Island. Miliammina fusca dominated low-marsh settings and Balticammina pseudomacrescens dominated the high marsh. These two species make up >98% of individuals. On Simeonof Island, 93% of individuals in high-marsh settings above mean high water were B. pseudomacrescens. The tidal flat on Simeonof Island was dominated by Cibicides lobatulus (60% of individuals), but the lower limit of this species is subtidal and was not sampled. These results indicate that uplift or subsidence caused by repeated earthquakes along the Alaska-Aleutian subduction zone could be reconstructed in coastal sediments using alternating assemblages of near monospecific B. pseudomacrescens and low-marsh or tidal-flat foraminifera.