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Recent Foraminifera from the Gulf of Alaska and Southeastern Alaska

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Recent Foraminifera from the Gulf of Alaska and Southeastern Alaska Recent Foraminifera From the Gulf of Alaska And Southeastern Alaska GEOLOGICAL SURVEY PROFESSIONAL PAPER 573-A Recent F orarninifera From the Gulf of Alaska And Southeastern Alaska By RUTH TODD and DORIS LOW CONTRIBUTIONS TO PALEONTOLOGY GEOLOGICAL SURVEY PROFESSIONAL PAPER 573-A A study resulting from a search for evidence that Pamplona Searidge is the foundered remnant of the I 8th century "Pamplona Rock" UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1967 UNITED STATES DEPARTMENT OF THE INTERIOR STEWART L. UDALL, Secretary GEOLOGICAL SURVEY William T. Pecora, Director For sale by the Superintendent of Documents, U.S. Government Printing Office Washington, D.C. 20402 - Price 55 cents (paper cover) CONTENTS Page: Systematic descriptions-Continued Page Abstract___________________________________________ AI Calcareous imperforate families___________________ A18 Introduction_______________________________________ 1 Miliolidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 18 Description of faunas________________________________ 2 Ophthalmidiidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 21 Analyses of samples_________________________________ 6 Calcareous perforate families_____________________ 21 Gulf of Alaska__________________________________ 6 Lagenidae_________________________________ 21 Southe astern Alaska_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 7 Polymorphinidae _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 25 Comparison with other assemblages___________________ 8 Buliminidae_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 26 Recent age____ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 8 Discorbidae________________________________ 30 Pleistocene or Pliocene age_______________________ 10 Rotaliidae _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 31 Age of Pamplona Searidge samples____________________ 10 Elphidiidae_ _ _ _ _ _ _ __ __ __ _ _ __ _ ___ _ _ __ __ _ _ _ __ 33 Conclusions________________________________________ 11 Anomalinidae _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 34 Systematic descriptions______________________________ 12 Rupertiidae_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ 35 Arenaceous families_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 12 ~onionidae________________________________ 35 Astror hizidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 12 Cassidulinidae__ _ _ _ _ _ __ __ __ _ _ _ __ _ __ __ _ __ _ ___ 36 Rhizamminidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 12 Chilostomellidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 38 Saccamminidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 12 Aragonitic family_______________________________ 38 Hyperamminidae _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 13 Robertinidae_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 38 Reophacidae_______________________________ 14 Planktonic families______________________________ 39 Ammodiscidae __ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 14 Globigerinidae______________________________ 39 LUuolidae_________________________________ 14 Globorotaliidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 39 Textulariidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 16 References cited____________________________________ 40 Verne ulinidae ______________ -· _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 16 Index_____________________________________________ 43 V alvulinidae _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 16 Trochamminidae __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 18 ILLUSTRATIONS [Plates 1-5 follow index] PLATE 1. Recent arenaceous Foraminifera from Alaska. 2. Recent arenaceous and porcellaneous Foraminifera from Alaska. 3. Recent Lagenidae, Polymorphinidae, and Buliminidae from Alaska. 4. Recent Buliminidae, Elphidiidae, Discorbidae, and Rotaliidae from Alaska. 5. Recent miscellaneous benthonic and planktonic Foraminifera from Alaska. Page FIGURE 1. Map of Gnlf of Alaska and southeastern Alaska showing location of dredged samples______ A3 TABLES Page TABLE 1. List of stations and locality data for Foraminifera samples_____________ A2 2. Distribution and abundance of Recent Foraminifera off Alaska_________ 4 III CONTRIBUTIONS TO PALEONTOLOGY RECENT FORAMINIFERA FROM THE GULF OF ALASKA AND SOUTHEASTERN ALASKA By RUTH ToDD and DoRIS Low ABSTRACT In each of these places numerous species were found in common Pamplona Searidge is a northeast-trending submarine ridge, with the present assemblrages. about 30 miles off the coast in the Gulf of Alaska, near the Comparisons were also made with three probably Pleistocene outer edge of the continental shelf. It now rises from sur­ or Pliocene occurrences : a submarine beach deposit near Nome, rounding depths of about 400 futhoms to within 68 fathoms of Amchitka Island in the Aleutians, and Middleton Island in the the surface and conceivably might have <been what 18th century Gulf of Ala·ska west of the searidge. Here, too, similarities Spanish and Russian explorers reported to be the dangerous were found with the present assemblages. rocky shoal, "Pamplona Rock." Search f.or evidence that Pamplona Searidge had formerly Three samples dredged between 85 and 100 fathoms from near been at a higher elevation near sea level was fruitless, but the top of Pamplona Searidge contain rich assemblages of at the same time the Foraminifera showed nothing that would Foraminifera dominated by Gassidulina californica and a. tor­ rule out such an interpretation. tuosa. Two samples were dredged from the sides ·of the sea­ ridge between 133 and 205 fathoms. The fauna of the shallower INTRODUCTION one-that between 133 and 148 fathoms--is similar to those on Five bottom samples from Pamplona Searidge in the the summit, but the deeper sample is dominated by Goesel"!Ja {tin til. Gulf of Alaska and six samples from various localities For comparison with the Foraminifera of the searidge, six in the fjords and bays of southeastern Alaska have samples from depths between 10 and 215 fathoms, dredged in yielded rich assemblages, consisting mostly of Recent the channels and bays of the fjordland of southeastern Alaska smaller Foraminifera but undoubtedly including fossil were also studied. These six S'amples reveal the faunal dis­ specimens as minor elements. tinctiveness of the various fjordland localities as contrasted with the comparative uniformity of the open environment of the Study of the Foraminifera from Pamplona Searidge searidge samples in the Gulf of Alaska. was made originally as a search for evidence that the Only two of the fjordland samples have dominating species, searidge had, within the last 180 years, foundered from namely ElpllidielZa g-roenlandiea and Gassfdulina lirnbata at a near-surface elevation where it may have been the Excursion Inlet and Rotalia colurnbiensis at Gambier Bay. Elsewhere, each assemblage eontains a group of major constitu­ ancient "Bajo Pamplona" reported in 1779 and charted ents with supplementary minor ones. Some of these major by the Spanish explorers as a dangerous rocky shoal constituents a're ReoplwJ· scot·piurus, Haplophragrnoides planis­ (Jordan, 1958, p. 3-4, fig. 2). Pamplona Searidge is simus, Cribrostornoides vrassimargo, A_tmnotium cassis, Gau­ now a 15-mile long submarine ridge, trending approxi­ dryina arenaria, Egget·ella adrena, QuinquelocuUna akneriana, mately northeast at right angles to the coastline, begin­ Globobulimina auriculata, Bolivina alata, Ut'i,qerina peregrina, ning about 30 miles offshore at the outer edge of the A._ngu1ogerina {tttens, Rosalina ornatissima, Buccella frigida, Elphid-ium clavatum, E. frigidum, Cibieides lobatulus, Florilus continental shelf. Its minimum depth, a rocky sub­ labradoricus, Nm~;ionella zwlchella, P.•wudononion auriculmn. marine promontory at 68 fathoms, is found at its outer and Astrononion gallowayi. (southwest) end. Altogether, 1-lO specit>s art> rt>cm·dt>d, and their distribution Three dredgings on the top and one from each side and abundance indicat~d. but about 8;) of them constitute a qnantit:atin•ly negligible part of the wholt> popul•ation of of Pamplona Searidge (hereafter referred to as Pam­ Foraminifera.
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