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Palaeogene Macrofossils from CRP-3 Drillhole, Victoria Land Basin, Antarctica

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Palaeogene Macrofossils from CRP-3 Drillhole, Victoria Land Basin, Antarctica Palaeogene Macrofossils from CRP-3 Drillhole, Victoria Land Basin, Antarctica Istituto cli Gcologia Marina. Consiglio Na~ionale(Idle Ricerche. via Gobclli 101. 1-40129 Bologna - Italy ~nstitutcof Geological & Nuclear Sciences. P.O. Box 30 308. Lower Hutt - New Zealand Received 5 March 200 1 : accf,p/ec/ in rcri.sed form 3 July 2001 Abstract - CRP-3 cored Palaeogene strata to 823 metres below the sea floor (mbsf). before passing through Devonian bedrock (Beacon Siipcrgroup) to a depth of 939 mbsf. Palaeogene body fossils have been identified at 239 horizons in the core. The best preserved macrofossils from the core help elucidate the taxonomy. chronology and biogeography of Cenozoic ecosystems of Antarctica. although poor preservation prevents identification to species level in most cases. The lithostratigraphic unit (LSU) of the core top (LSU I. I) contains an almost inonospecific modiolid assemblage, similar to mussel beds recovered in the bottom part of the CRP-212A core. These semi-infauna1 mussels appear to be conspecific, apparently indicating the same age (Early Oligocene) and environment, i.e., a deep muddy shelf characterized by high turbidity and dysoxiclanoxic bottom conditions (high H,S sediment content). LSU 1.2 contains reasonably diverse assemblages representing innerlmiddle shelf environments dominated by epifa~inal suspension feeders. LSU 2.1 contains low-diversity assemblages of suspension feeders (bivalves. brachiopods and bryzoans), probably indicating innerlmiddle shelf environments. LSU 3.1 contains assemblages including infaunal and epifaunal suspension feeders (bivalves, including a scallop, ?Ada/71;(ssiumn.sp.. and solitary corals) and infaunal deposit-feeders, possibly indicating deposition on a deep muddy shelf. Both the coral and the scallop previously have been recorded from Oligocene to Miocene rocks in Antarctica. Inner to middle shelf environments are suggested by macrofossils in LSU 5.1. mostly infaunal and epifaunal suspension-feeding bivalves. A similar environment is suggested for LSU 6.1, which contains epifaunal scallops and gastropods and infaunal bivalves. LSU 8.1 contains a relatively diverse macrofa~inaof infauna1 suspension feeding bivalves and semi-infaunal/epifaunal gastropods, probably indicating middle shelf environments. ?Aclc~m~~,~siumn.sp. occurs lowest in LSU 8.1, establishing an Oligocene age for CRP-3 down to 320.43 mbsf. One poorly preserved gastropod at 359.07 mbsf indicates marine deposition for LSU 9.1. The only ~nacrofossilbelow this is one modiolid mussel in LSU 13.2. The species apparently is different from that observed in the top of CRP-3. An Eocene age for this mussel is possible but uncertain. The presence of relatively warm-water taxa in the diamicton-dominated part of the CRP-3 core indicates that these taxa did not become extinct abruptly with the onset of Antarctic glaciation, but progressively decreased in diversity as sea-temperatures gradually decreased. INTRODUCTION Project core repository facility in Bremerhaven (Germany). Macrofossils suitable for more detailed CRP-3 hole, drilled at 77.011° and 163.640°E palaeontological study were cleaned at the Crary about 12 km east of Cape Roberts, in the Ross Sea, Science & Engineering Center at McMurdo Station reached 939 metres below sea floor (mbsf). wit using dental tools and delicate specimens hardened recovered a thick Palaeogene (Oligocene-?Eocene) using a solution of water and dilute PVA glue. succession capping Palaeozoic (Devonian) rocks of This report is based on a selection of the best the Beacon Supergroup (Cape Roberts Science Team. preserved and most identifiable body macrofossils. 2000). Even so, most fossils are minute, highly fragmented 239 macrofossiliferous horizons have been andlor highly decalcified, and their poor preservation identified in core from CRP-3. Horizons initially state made their identification challenging. As in identified at the Cape Roberts Laboratory were previous reports on CRP macropalaeontology, many inspected in the Crary Science & Engineering Center taxa from CRP-3 have not been identified to specific at McMurdo Station. Macrofossil material not suitable or even generic level. The collection is temporarily for further palaeontological investigation was either retained as a discrete entity in the Institute of sampled for geochemical (oxygen and carbon stable Geological and Nuclear Sciences, Lower Hutt. isotope composition, Ss-chronology) and diagenetic Macrofossils are common in the Oligocene section studies or stored to be shipped to the Cape Roberts of the core, providing further palaeontological "Correspondiq author ([email protected]) doc~imentationof marine macroinvertebrates for this environment low in the core (LSU 9.1 and l .\.?), epoch in Antarctica. The CRP-3 drill core adds new Uicse may prove to be of diagnostic v;iI~it,, data to the growing palaeobiological information for considering the overall scarcity of palaeontoloi~ic~al the Oligocene epoch in Antarctica, which combines information in the lower past of the core. results from previous drilling operations in the Ross Sea region: DSDP Leg 28 (Dell & Fleming, 1975). CIROS-1 (Beu & Dell, 1989). and CRP-212A (Taviani TAPHONOMY et al., 2000) and from erratics at McMurdo Sound (l Iarwood & Levy, 2000: Stilwell & Feldmann, 2000). Dia~pnesis.Most carbonate is in an advancril A few CRP-3 macrofossils, however, originated from stage of dissolution (Cape Roberts Science 'l'i-iiii~. sedin~entaryunits of uncertain age and depositional 2000). In general, only calcitic fossils of peelini(1 Sill sand travel . .:. -. ........ ..... ---P--****. -: $SO-'.. .:. 1, -:; :*:L- -.. ... .: ........ - - L.'....-+ -. ..... -.-. .. jOOÑ .' . " KEY ""'7 Clam 6.-,.A Br>ozoan 7>. ~eaf 0 ,F-, :;, Plant . Scrpuiid ^' Echinoid . Cirripcd 'CG fiagment Fig. 1 - Litliostratigraphical summary of the CRP-3 drill core showing-. position and composition of the major macrofossil assemblages (slightly modified from Cape Roberts Science Team. 2000). I'c~lacopcn~'Mcicrolossi Is from ('RP-.! Drillholr 425 bivalves (i.e.. ?Aclamussiuni n.sp. ). worms (scrpiil id 8.1 as uni~len~ii'ieclbivalves (Cape Roberts Science polycliaetes) and ecliinoids are well preserved. Most 'I'eani, 2000). Barnacles (('irripedia) have only rarely aragonitic bivalves and gastropods show advancecl been reported from the CXeno/.oicof Antarctica (Zullo decalcil'icii~ionand are represented by moulds. some ct ill.. 1988: Biickcridgc. 2000) ;ind the S~ibantarctic of which retain a veneer of chalky carbonate. Shell (Carriol ci (it., 1992: (iirct et al.. 1994). The CRP-3 breakage ;ind fragmentation is common in the CRP-3 material consists of a very small fi~agiiientof the core but we are unsure whether it is mostly linked to ~iiar~inof a sti.oiigly ribbed shell at 168.39 mbsf. skeletal dissolution (as we suspect) or to rev,!orkiiig. (presumably a friigment of a barnacle plate. recorded CaCO:; concretioning has been observed around in the Initial Report as "small crenulate shell bivalves and gastropods at 141.20 and 359.07 mbsf fragment"), and one sm;ill. incomplete but well- and in the sediment matrix infilling serpulid prescrvei-1 balanoicl barnacle plate. plus several polycliiicte tubes (e.g., at 38.53 mbsf). Pyritized fragments of other plates. at 308.68 mbsf (recorded in moulds of bivalves occur in LSU 1.3 at 64.42 mbsl'. the Initial Report as "many small fragments of unidentified bivalves"). TAXONOMY Eight phyla of marine Invertebrata have been identified positively in the CRP-3 drill core. They are, BIVALVIA in order of relative abundance, Mollusca, Annelida, Cnidaria. Brachiopoda. Crustacea, Bryozoa, WUCULIDAE Echinodennata and Porifera (Fis. 1). Re-examination ?N~/culasp. of the inferred Vertebrata (fish remains) recorded in - 122.22-122.24 mbsf: One very small. articulated, the Initial Report at 406.36 and 406.38 mbsf (Cape chalky bivalve. hinge not visible. Roberts Science Team, 2000) reveals that such Remarks: Small Nuculidae occur in the Cretaceous- macrofossils are very likely plant fragments. Palaeogene of Antarctica. including the Ross Sea Macroplant remains were also identified in CRP-3, as region (Beu & Dell, 1989; Stilwell, 2000: Taviani leaves (Nothofagus sp.) and stems (Cape Roberts et al., 2000). Science Team, 2000, fig. 5.9d, 111) and are discussed in detail by Cantrill (this volume). The organic nature SAREPTIDAE of putative macrofossils from LSU 12.3 (465.77, ?Yolcliella sp. 509.16 and 533.47 mbsf: Cape Roberts Science Team, - 120.34-120.37 mbsf: Incomplete left valve of small, 2000) could not be confirmed. elongate, smooth protobranch bivalve, taxodont Macrofossils from CRP-3 have been treated in hinge visible, aff. Yoldiella. some detail in the Initial Report (Cape Roberts - 122.22-122.24 n~bsf: One small left valve of a smooth pi-otobranch(?) bivalve, shaped as in Science Team. 2000) and the best preserved Ti~iclc~ria,Jupiferia, etc., hinge not visible; outline specimens are figured there. The present article offers most nearly resembles those of Yoldiella antarctica an updated perspective of the macrofossil assemblages (Thiele) and Y. prof~indora(Melvill & Standen) with special reference to Mollusca, and their (Dell, 1990, figs. 17, 21). ecological and biogeographical significance. Annelida - 124.93-124.96 mbsf: Several small bivalves, at least are also discussed here. 3 valves, smooth, chalky, no hinges visible, but Mollusca are by far the dominant group and presumably the same taxon as above; another include, conservatively, at least 15 species
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