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A new technique to separate conodont elements from heavier minerals 从较重的矿物中分离牙形石元素的新技术
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1999-01-01 DOI: 10.1080/03115519908619339
L. Jeppsson, Rikard Anehus
{"title":"A new technique to separate conodont elements from heavier minerals","authors":"L. Jeppsson, Rikard Anehus","doi":"10.1080/03115519908619339","DOIUrl":"https://doi.org/10.1080/03115519908619339","url":null,"abstract":"The density of conodont elements is between 2.90 g cm-3 and 3.04 g cm-3, probably very close to 3.00. Removing all traces of dolomite and calcium carbonate before density separation keeps the viscosity of sodium polytungstate solution low enough to make it useful for density separations as high as 3.04 g cm-3. In most cases, a nearly clean phosphatic fraction can be produced by adding this method to existing standard techniques. The oxidizing technique to remove pyrite is also discussed. In all kinds of physical concentration work consideration of the “bulk density” is very important for good results, especially regarding coniforms.","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"23 1","pages":"57-62"},"PeriodicalIF":1.3,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519908619339","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59989832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 36
Cretaceous Scaphopoda (Mollusca) of Australia and their palaeobiogeographic significance 澳大利亚白垩纪贝壳类软体动物及其古地理意义
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1999-01-01 DOI: 10.1080/03115519908619517
J. Stilwell
{"title":"Cretaceous Scaphopoda (Mollusca) of Australia and their palaeobiogeographic significance","authors":"J. Stilwell","doi":"10.1080/03115519908619517","DOIUrl":"https://doi.org/10.1080/03115519908619517","url":null,"abstract":"The Cretaceous scaphopod (molluscan) fauna of mainland Australia is characterised by a rather depauperate and poorly known assemblage of five species: dentaliids Dentalium (Dentalium) n. sp. A (probably Aptian), Dentalium (Dentalium) n. sp. B (Cenomanian), and Dentalium (Dentalium) n. sp. C (Maastrichtian); fustiariid Fustiaria wollumbillaensis (Etheridge, Jr., 1892) (Late Aptian-Albian?); and laevidentaliid Laevidentalium cretaustralium n. sp. (Late Albian). Each species is endemic to either the Great Artesian Basin or Carnarvon Basin of Australia. A probable sixth species is recorded from Cenomanian deposits of Bathurst Island, but the affinity of this taxon is uncertain. In some shell beds of the Allaru Formation, scaphopods dominate the preserved macrobenthos. Although at species level the fauna is endemic, strongly cosmopolitan genus level links of the scaphopods mirror that of other groups of molluscs (bivalves, gastropods, cephalopods), indicating derivation from evolutionary separation from pre-ex...","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"23 1","pages":"215-226"},"PeriodicalIF":1.3,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519908619517","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59990460","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Discovery of an Early Permian (Late Sakmarian) ammonoid from Langkawi Island, Malaysia 马来西亚兰卡威岛早二叠世(晚萨克纪)菊石的发现
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1999-01-01 DOI: 10.1080/03115519908527810
T. Leonova, Mohd. Shafeea Leman, G. Shi
{"title":"Discovery of an Early Permian (Late Sakmarian) ammonoid from Langkawi Island, Malaysia","authors":"T. Leonova, Mohd. Shafeea Leman, G. Shi","doi":"10.1080/03115519908527810","DOIUrl":"https://doi.org/10.1080/03115519908527810","url":null,"abstract":"This paper describes a single specimen of Metalegoceras sp. recently discovered from the upper part of the Singa Formation at Batu Asah on the main Langkawi Island off the northwestern coast of Peninsular Malaysia. The discovery represents the first report of a Permian ammonoid from the island and from the Singa Formation and confirms a Sakmarian (Early Permian) age for this part of the formation suggested by brachiopods.","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"23 1","pages":"277-281"},"PeriodicalIF":1.3,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519908527810","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59989128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Foraminiferal linings and other organic walled microfossils from the Devonian of the Tamworth Belt, northern New South Wales, Australia 澳大利亚新南威尔士州北部塔姆沃思带泥盆纪有孔虫衬里和其他有机壁微化石
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1999-01-01 DOI: 10.1080/03115519908619513
T. Winchester-Seeto, K. Bell
{"title":"Foraminiferal linings and other organic walled microfossils from the Devonian of the Tamworth Belt, northern New South Wales, Australia","authors":"T. Winchester-Seeto, K. Bell","doi":"10.1080/03115519908619513","DOIUrl":"https://doi.org/10.1080/03115519908619513","url":null,"abstract":"Early to Late Devonian (Emsian to late Famennian) organic walled microfossils were recovered from nineteen localities throughout the Tamworth Belt, northern New South Wales. The microfossil assemblages included poorly preserved chitinozoans and scolecodonts, spores and moderately well preserved foraminiferal linings. Fourteen species of foraminiferal linings from six genera are documented. At least three species of foramininferal linings (Inauris tubulata, Saccammina mea and Thurammina pustulosa) show potential for global correlation. Saccammina sp. cf. S. ampullacea and Thurammina mirrka may have application for correlation within Australia.","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"23 1","pages":"155-175"},"PeriodicalIF":1.3,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519908619513","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59990132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 6
First occurrence of a subfossil stomatopod crustacean from Australia 澳大利亚首次发现亚化石口足甲壳类动物
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1999-01-01 DOI: 10.1080/03115519908619518
S. Ahyong, M. Ebach
{"title":"First occurrence of a subfossil stomatopod crustacean from Australia","authors":"S. Ahyong, M. Ebach","doi":"10.1080/03115519908619518","DOIUrl":"https://doi.org/10.1080/03115519908619518","url":null,"abstract":"","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"70 1","pages":"227-228"},"PeriodicalIF":1.3,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519908619518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59990477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A new petauroid possum from the Oligo-Miocene of Riversleigh, northwestern Queensland 来自昆士兰西北部里弗斯利渐新-中新世的一种新的petauroid负鼠
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1999-01-01 DOI: 10.1080/03115519908619337
J. Brammall
{"title":"A new petauroid possum from the Oligo-Miocene of Riversleigh, northwestern Queensland","authors":"J. Brammall","doi":"10.1080/03115519908619337","DOIUrl":"https://doi.org/10.1080/03115519908619337","url":null,"abstract":"Djaludjangi yadjana sp. nov. represents a previously unknown genus of petauroid possum from Riversleigh in northwestern Queensland. Of known phalangeridans Djaludjangi most closely resembles the Petauridae, but lacks synapomorphies previously used to define that family. Although considered likely a plesiomorphic petaurid, D. yadjana is referred here to Petauroidea: incertae sedis, pending comprehensive revision of phalangeriform dental character state distributions. Small possum diversity at Riversleigh indicates a complex and finely partitioned environment such as that found in present-day tropical forests; the discovery at Riversleigh of Australia's first Tertiary dactylopsiline species also argues for a rainforest palaeohabitat.","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"23 1","pages":"31-50"},"PeriodicalIF":1.3,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519908619337","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59989964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 16
Late Cretaceous Mollusca from the Chatham Islands, New Zealand 新西兰查塔姆群岛的白垩纪晚期软体动物
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1998-01-01 DOI: 10.1080/03115519808619238
J. Stilwell
{"title":"Late Cretaceous Mollusca from the Chatham Islands, New Zealand","authors":"J. Stilwell","doi":"10.1080/03115519808619238","DOIUrl":"https://doi.org/10.1080/03115519808619238","url":null,"abstract":"The Cretaceous Mollusca (Bivalvia, Gastropoda, Scaphopoda) from the Chatham Islands, New Zealand consists of a moderately diverse faunule of 37 species in the Kahuitara Tuff of Pitt Island. At least 16 (c.43%) of the taxa are conspecific with mainland New Zealand species and at least 15 (c.41%) taxa are endemic to Chatham Islands. New species proposed are Crenella n. sp., Chlamys (Lyriochlamys) n. sp., Chlamys s. l. n. sp., Camptonectes n. sp., Eburneopecten freneixae n. sp., Dimyodon n. sp., Purpurocardia n. sp., Lahillia n. sp., Solyma flemingae n. sp., Brookula s. l. n. sp., Calliomphalus s. l. n. sp., Pyrgulifera kahuitara n. sp., and Ageria? n. sp. Most taxa (c.41%) are epifaunal suspension feeding bivalves and dominate the Cretaceous macrofauna. Less dominant are infaunal suspension feeding bivalves (30%). Epifaunal browsers (c.14%), deposit feeders (8%) and carnivores (5%) are minor components. An open marine, shallow shelf environment is advocated. A latest Cretaceous (Campanian?-Maastrichtian) ag...","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"22 1","pages":"29-85"},"PeriodicalIF":1.3,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519808619238","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59988688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
New capitosaurid amphibians from the Triassic Denwa Formation of the Satpura Gondwana Basin, central India 印度中部Satpura Gondwana盆地三叠纪Denwa组的新头龙类两栖动物
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1998-01-01 DOI: 10.1080/03115519808619330
R. Mukherjee, D. Sengupta
{"title":"New capitosaurid amphibians from the Triassic Denwa Formation of the Satpura Gondwana Basin, central India","authors":"R. Mukherjee, D. Sengupta","doi":"10.1080/03115519808619330","DOIUrl":"https://doi.org/10.1080/03115519808619330","url":null,"abstract":"Two new species of the genus Parotosuchus, (Family Capitosauridae) with semi-closed otic notches, from the Denwa Formation, Satpura Gondwana Basin, India are described from well preserved, complete skulls. Capitosaurids from India were known from fragmentary material only. The relationship among the two new species and other related forms is briefly discussed.","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"162 1","pages":"317-327"},"PeriodicalIF":1.3,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519808619330","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59988896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 37
Revised systematics and palaeobiogeography of some Late Triassic colonial invertebrates from the Pacific region 太平洋地区晚三叠世无脊椎动物群落的系统学和古生物地理学订正
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1998-01-01 DOI: 10.1080/03115519808619194
P. Schäfer, J. Grant‐Mackie
{"title":"Revised systematics and palaeobiogeography of some Late Triassic colonial invertebrates from the Pacific region","authors":"P. Schäfer, J. Grant‐Mackie","doi":"10.1080/03115519808619194","DOIUrl":"https://doi.org/10.1080/03115519808619194","url":null,"abstract":"Revision of type and additional material of Upper Triassic colonial organisms from New Zealand, New Caledonia, Timor, Siberia, Canada and Chile, previously interpreted as Bryozoa or Cnidaria, provides new insights into their palaeobiology, systematic affinity and palaeobiogeography. Heterastridium conglobatum Reuss remains of uncertain hydrozoan affinity, and could be spheractinoidean, hydroidean, or even milleporine. H. conglobatum disciforme n. subsp. (=“forma” disciforme sensu Gerth) is described from New Zealand. The distribution of Heterastridium in the Murihiku and Torlesse terranes of New Zealand-New Caledonia is documented, and it is recorded as ranging through the Middle and Late Norian (Rutherfordi, Columbianus, and Cordilleranus Zones). Its extreme rarity in the Torlesse terrane is thought to be the result of unsuitable facies. “Monotrypella” timorica Vinassa de Regny, described as a bryozoan, is a calcareous demosponge of uncertain family and genus. “M” maorica Wilckens is shown to be the seni...","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"22 1","pages":"87-122"},"PeriodicalIF":1.3,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519808619194","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59987808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 15
Genyornis newtoni and Dromaius novaehollandiae at 30,000 b.p. in central northern New South Wales 牛顿Genyornis newton和新荷兰dromaus novaehollandiae，生活在距今3万年的新南威尔士州中北部
IF 1.3 4区 地球科学
Alcheringa Pub Date : 1998-01-01 DOI: 10.1080/03115519808619199
Judith H. Field, W. Boles
{"title":"Genyornis newtoni and Dromaius novaehollandiae at 30,000 b.p. in central northern New South Wales","authors":"Judith H. Field, W. Boles","doi":"10.1080/03115519808619199","DOIUrl":"https://doi.org/10.1080/03115519808619199","url":null,"abstract":"Fossil remains of Genyornis newtoni and Dromaius novaehollandiae recovered from horizons at Cuddie Springs, in central northern New South Wales, are securely dated to greater than 30,000 b.p. Genyornis newtoni and D. novaehollandiae were found in sequential layers in association with artefacts of human occupation and other species of megafauna. Palaeoenvironmental information indicates the specimens of G. newtoni were deposited when the region supported an arid vegetation community, principally chenopod shrubland with scattered Eucalyptus and Acacia species. The appearance of Dromaius and disappearance of Genyornis coincided with a local shift to grasslands and the drying of the Cuddie Springs lake. New evidence is presented for the persistence of Genyornis in the arid zone during the lead up to the Last Glacial Maximum.","PeriodicalId":50830,"journal":{"name":"Alcheringa","volume":"22 1","pages":"177-188"},"PeriodicalIF":1.3,"publicationDate":"1998-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/03115519808619199","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"59988475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 21
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