The Tumblagooda Sandstone revisited: exceptionally abundant trace fossils and geological outcrop provide a window onto Palaeozoic littoral habitats before invertebrate terrestrialization

AbstractThe establishment of permanent animal communities on land was a defining event in the history of evolution, and one for which the ichnofauna and facies of the Tumblagooda Sandstone of Western Australia have been considered an archetypal case study. However, terrestrialization can only be understood from the rock record with conclusive sedimentological evidence for non-marine deposition, and original fieldwork on the formation shows that a marine influence was pervasive throughout all trace fossil-bearing strata. Four distinct facies associations are described, deposited in fluvial, tidal and estuarine settings. Here we explain the controversies surrounding the age and depositional environment of the Tumblagooda Sandstone, many of which have arisen due to the challenges in distinguishing marine from non-marine depositional settings in lower Palaeozoic successions. We clarify the terminological inconsistency that has hindered such determination, and demonstrate how palaeoenvironmental explanations can be expanded out from unambiguously indicative sedimentary structures. The Tumblagooda Sandstone provides a unique insight into an early Palaeozoic ichnofauna that was strongly partitioned by patchy resource distribution in a littoral setting. The influence of outcrop style and quality is accounted for to contextualize this ichnofauna, revealing six distinct low-disparity groups of trace fossil associations, each related to a different sub-environment within the high-ichnodisparity broad depositional setting. The formation is compared with contemporaneous ichnofaunas to examine its continued significance to understanding the terrestrialization process. Despite not recording permanent non-marine communities, the Tumblagooda Sandstone provides a detailed picture of the realm left behind by the first invertebrate pioneers of terrestrialization.

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New conodont records of the Los Sombreros Formation (Cambrian–Ordovician) from the Western Precordillera, Argentina: biostratigraphic and palaeoenvironmental implications

Geological Magazine ◽

10.1017/s0016756819001055 ◽

2019 ◽

Vol 157 (4) ◽

pp. 539-550

Author(s):

Gabriela Torre ◽

Guillermo L. Albanesi

Keyword(s):

Continental Margin ◽

Carbonate Platform ◽

South American ◽

The South ◽

Depositional History ◽

The Matrix ◽

Minimum Age ◽

History Of ◽

Lower Palaeozoic ◽

Early Palaeozoic

AbstractThe presence of a carbonate platform that interfingers towards the west with slope facies allows for the identification of an ancient lower Palaeozoic continental margin in the Western Precordillera of Argentina. The Los Sombreros Formation is essential for the interpretation of the continental slope of the Precordillera, which accreted to Gondwana as part of the Cuyania Terrane in the early Palaeozoic. The age of these slope deposits is controversial; therefore, a precise biostratigraphic scheme is critical to reveal the evolution of the South American continental margin of Gondwana. The study of lithic deposits of two sections of the Los Sombreros Formation, the El Salto and Los Túneles sections, provides important information for further understanding the depositional history of the slope. At El Salto section, the conodonts recovered from an allochthonous block refer to the Cordylodus proavus Zone (upper Furongian). The conodonts recovered from the matrix of a calclithite bed of the Los Sombreros Formation in the Los Túneles section are assigned to the Lenodus variabilis Zone (early Darriwilian), providing a minimum age for this stratigraphic unit. In addition, clasts from this sample yielded conodonts from the Paltodus deltifer − Macerodus dianae zones (upper Tremadocian). The contrasting conodont colour alterations and preservation states from the elements of two latter records, coming from the same sample, argue the reworked clasts originated in the carbonate platform and later transported to the slope during the accretion process of the Precordilleran Terrane to the South American Gondwanan margin during the Middle–Late Ordovician.

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THE INFLUENCE OF DEPOSITIONAL ENVIRONMENT AND BASIN HISTORY ON THE TAPHONOMY OF MAMMALIAN ASSEMBLAGES FROM THE BARSTOW FORMATION (MIDDLE MIOCENE), CALIFORNIA

Palaios ◽

10.2110/palo.2019.067 ◽

2020 ◽

Vol 35 (4) ◽

pp. 175-190

Author(s):

KATHARINE M. LOUGHNEY ◽

CATHERINE BADGLEY

Keyword(s):

Middle Miocene ◽

Element Composition ◽

Depositional Environments ◽

Skeletal Element ◽

Ephemeral Wetland ◽

Facies Associations ◽

History Of ◽

Fossil Assemblages ◽

Depositional Setting ◽

Barstow Formation

ABSTRACT The Barstow Formation in the Mojave region of California was deposited in an extensional-basin setting of the Basin and Range province and preserves diverse middle Miocene mammalian assemblages. Six facies associations represent the dominant depositional environments in the basin, which changed through time from alluvial-fan and playa-dominated settings to floodplains and spring-fed wetlands. The majority of fossil localities and specimens occur in later-forming facies associations. We analyzed the taphonomic characteristics of fossil assemblages to test whether basin-scale facies associations or locality-scale facies exert more control on the preservational features of mammalian assemblages through the formation. We documented the facies settings of 47 vertebrate localities in the field in order to interpret depositional setting and the mode of accumulation for fossil assemblages. We evaluated skeletal material in museum collections for taphonomic indicators, including weathering stage, original bone-damage patterns, hydraulic equivalence, and skeletal-element composition. We evaluated four alternative modes of accumulation, including attritional accumulation on the land surface, accumulation by fluvial processes, carnivore or scavenger accumulations, and mass-death events. The majority of localities represent attritional accumulations at sites of long-term mortality in channel-margin, abandoned-channel, poorly drained floodplain, and ephemeral-wetland settings. Skeletal-element composition and taphonomic characteristics varied among facies, indicating an important role for depositional setting and landscape position on fossil-assemblage preservation. We find that locality-scale facies have a greater influence on the taphonomic characteristics of fossil assemblages; the taphonomy of each facies association is influenced by the facies that compose it. The facies composition and distribution within facies associations change through the formation, with a greater variety of depositional settings forming later in the history of the basin. Heterogeneous landscapes present more settings for fossil accumulation, contributing to the increase in fossil occurrence through the depositional history of the formation.

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Early Palaeozoic history of the upper Beardmore Glacier area: implications for a major Antarctic structural boundary within the Transantarctic Mountains

Antarctic Science ◽

10.1017/s0954102089000374 ◽

1989 ◽

Vol 1 (3) ◽

pp. 249-260 ◽

Cited By ~ 29

Author(s):

A.J. Rowell ◽

Margaret N. Rees

Keyword(s):

Volcanic Rocks ◽

Glacier Area ◽

Late Cambrian ◽

History Of ◽

Lower Palaeozoic ◽

Transantarctic Mountains ◽

Early Palaeozoic ◽

Middle And Late Cambrian ◽

Structural Boundary ◽

Early Late

The central and western Transantarctic Mountains appear to be divided longitudinally by one or more terrane boundaries that separate two regions characterized by different Lower Palaeozoic successions. Re-examination of the upper Beardmore Glacier area and reinterpretation of its Early Palaeozoic stratigraphy emphasizes the strong similarity between it and the Byrd Group outcrops in the area between the Byrd and Nimrod glaciers. This similarity demonstrates that for several hundred kilometres the Cambrian succession of an inboard region is largely devoid of volcanic rocks but includes fossiliferous Lower Cambrian platformal limestones that are overlain unconformably by coarse basin-fill deposits. The latter probably include beds of Middle and perhaps early Late Cambrian age that were themselves deformed prior to the Devonian. Erratic blocks indicate that comparable successions may have been developed as far west as the Whichaway Nunataks. The inferred geological history of this part of the continental margin, which is commonly regarded as autochthonous, stands in contrast to that of more outboard regions where thick volcanic sequences occur in expanded stratigraphic sections that include shallow-marine Middle and Late Cambrian deposits. We consider that these regions, predominantly the Queen Maud and Theil mountains and the Neptune Range of the Pensacola Mountains, constitute one or more displaced crustal blocks. The boundary between them and the inboard sequence adjacent to the craton is probably a series of large strike-slip faults that may have been initiated during the Early Palaeozoic and have been active episodically since then.

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I.—History of the Names Cambrian and Silurian in Geology

Geological Magazine ◽

10.1017/s0016756800466422 ◽

1873 ◽

Vol 10 (111) ◽

pp. 385-395 ◽

Cited By ~ 1

Author(s):

T. Sterry Hunt

Keyword(s):

Great Britain ◽

North America ◽

Upper Cambrian ◽

History Of ◽

Lower Palaeozoic ◽

The Subject

It is proposed in the following pages to give a concise account of the progress of investigation of the lower Palæozoic rocks during the last forty years. The subject may naturally be divided into three parts: 1. The history of Silurian and Upper Cambrian in Great Britain from 1831 to 1854; 2. That of the still more ancient Palæozoic rocks in Scandinavia, Bohemia, and Great Britain up to the present time, including the recognition by Barrande of the so-called primordial Palæozoic; fauna; 3. The history of the lower Palæozoic rocks of North America.

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Age, evolution and tectonic history of the Highland Border Complex, Scotland

Transactions of the Royal Society of Edinburgh Earth Sciences ◽

10.1017/s0263593300013778 ◽

1984 ◽

Vol 75 (2) ◽

pp. 113-133 ◽

Cited By ~ 84

Author(s):

Gordon B. Curry ◽

B. J. Bluck ◽

C. J. Burton ◽

J. K. Ingham ◽

David J. Siveter ◽

...

Keyword(s):

Regional Scale ◽

Plate Boundary ◽

North American Plate ◽

Tectonic History ◽

Lower Ordovician ◽

Northwestern Margin ◽

Comprehensive Survey ◽

History Of ◽

Early Palaeozoic ◽

Western Ireland

I. ABSTRACT: Research interest in the Highland Border Complex has been pursued sporadically during the past 150 years. The results and conclusions have emphasised the problems of dealing with a lithologically disparate association which crops out in isolated, fault-bounded slivers along the line of the Highland Boundary fault. For much of the present century, the debate has centred on whether the rocks of the complex have affinities with the Dalradian Supergroup to the N, or are a discrete group. Recent fossil discoveries in a wide variety of Highland Border rocks have confirmed that many are of Ordovician age, and hence cannot have been involved in at least the early Grampian deformational events (now accurately dated as pre-Ordovician) which affect the Dalradian Supergroup. Such palaeontological discoveries form the basis for a viable biostratigraphical synthesis. On a regional scale, it is apparent that the geological history of the Highland Border rocks must be viewed in the context of plate boundary tectonism along the entire northwestern margin of Iapetus during Palaeozoic times.II. ABSTRACT: Silicified articulate brachiopods from the Lower Ordovician (Arenig) Dounans Limestone are extremely rare but the stratigraphically diagnostic generaArchaeorthisSchuchert and Cooper, andOrthidiumHall and Clarke, have been identified. In addition, three specimens with characteristic syntrophiid morphology have been recovered. Inarticulate brachiopods are known from Stonehaven and Bofrishlie Burn near Aberfoyle, and have also been previously recorded from Arran.III. ABSTRACT: Micropalaeontological investigation of the Highland Border Complex has produced a range of microfossils including chitinozoans, coleolids, calcispheres and other more enigmatic objects. The stratigraphical ranges of the species lie almost entirely within the Ordovician and reveal a scatter of ages for different lithologies from the Arenig through to the Caradoc or Ashgill, with a pronounced erosional break between the Llandeilo and the Caradoc.IV. ABSTRACT: A Lower Ordovician (Arenig Series) silicified ostracode fauna from the Highland Border Dounans Limestone at Lime Craig Quarry, Aberfoyle, Central Scotland, represents the earliest record of this group of Crustacea from the British part of the early Palaeozoic ‘North American’ plate.V. ABSTRACT: Palaeontological age determinations for a variety of Highland Border rocks are presented. The data are based on the results of recent prospecting which has demonstrated that macro- and microfossils are present in a much greater range of Highland Border lithologies than previously realised. Data from other studies are also incorporated, as are modern taxonomie re-assessments of older palaeontological discoveries, in a comprehensive survey of Highland Border biostratigraphy. These accumulated data demonstrate that all fossiliferous Highland Border rocks so far discovered are of Ordovician age, with the exception of the Lower Cambrian Leny Limestone.VI. ABSTRACT: The Highland Border Complex consists of at least four rock assemblages: a serpentinite and possibly other ophiolitic rocks of Early or pre-Arenig age; a sequence of limestones and conglomerates of Early Arenig age; a succession of dark shales, cherts, quartz wackes, basic lavas and associated volcanogenic sediments of Llanvirn and ? earlier age; and an assemblage of limestones, breccias, conglomerates and arenites with subordinate shales of Caradoc or Ashgill age. At least three assemblages are divided by unconformities and in theirmost general aspect have similarities with coeval rocks in western Ireland.The Highland Border Complex probably formed N of the Midland Valley arc massif in a marginal sea comparable with the Sunda shelf adjacent to Sumatra–Java. Strike-slip and thrust emplacement of the whole Complex in at least four episodes followed the probable generation of all or part of its rocks by pull-apart mechanisms.

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Epilogue

Growing Up with the Country ◽

10.12987/yale/9780300180527.003.0006 ◽

2018 ◽

Author(s):

Kendra Taira Field

Keyword(s):

Twentieth Century ◽

Jim Crow ◽

Great Migration ◽

Left Behind ◽

History Of ◽

The Great Migration ◽

Image Fit ◽

The 1950S ◽

Back To Africa

“Grandpa went back to Africa with Garvey,” my grandmother recalled. I carried this precious refrain into the archives with me. In Garvey’s place, I found Chief Sam, in the black and Indian borderlands of Oklahoma. While the Great Migration had largely displaced the preceding history of black rural emigration at the nadir, so had Garveyism displaced descendants’ memories of the Chief Sam movement. Meanwhile, scholars portrayed the movement as the product of a single charismatic charlatan and his nameless, faceless followers. Relying almost exclusively on U.S. sources and the memories of those “left behind” in an economically depressed and politically repressed Jim Crow Oklahoma, the only book-length study of the movement, written in the 1950s, argued that the Chief Sam movement illustrated “the desperate hopes of an utterly desperate group of people.” The image fit easily with twentieth-century American tropes of black victimhood and criminality....

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Biblical Ladies in Roman Garb

Philo of Alexandria ◽

10.12987/yale/9780300175233.003.0007 ◽

2018 ◽

Author(s):

Maren R. Niehoff

Keyword(s):

Active Role ◽

Gender Issues ◽

Mothers And Daughters ◽

Left Behind ◽

Historical Figures ◽

Biblical Women ◽

History Of ◽

Change Of Perspective ◽

The Law

This chapter addresses Philo's refashioning of the biblical women in the Exposition of the Law, which differs significantly from his interpretation of them in Allegorical Commentary. They no longer symbolize the dangerous body with its passions, best to be left behind, but rather have become exemplary wives, mothers, and daughters who play an active role in the history of Israel. This dramatic change of perspective can be explained in terms of Philo's move from Alexandria to Rome. While gender issues were not discussed in the philosophical circles of his home city, he later encountered lively philosophical discussions in Rome on the role of women in society. His new image of the biblical women in the Exposition closely corresponds to his view of the Roman empress Livia, whose clear-sightedness, strength, and loyalty he appreciates. The biblical women likewise become real historical figures whom Philo interprets sympathetically from within.

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Some Data on Pottery of Osipovskaya and Mariinskaya Cultures of the Lower Amur Region

Краткие сообщения Института археологии (КСИА) ◽

10.25681/iaras.0130-2620.250.202-214 ◽

2018 ◽

Author(s):

Ю.Б. Цетлин ◽

В.Е. Медведев

Keyword(s):

Amur Region ◽

Early Neolithic ◽

Technological Processes ◽

Left Behind ◽

Lower Amur Region ◽

Ethnocultural Groups ◽

History Of ◽

Neolithic Cultures ◽

Comprehensive Study

Статья посвящена результатам всестороннего изучения гончарных традиций в технологии, формах и орнаментации посуды у носителей осиповской и мариинской неолитических культур в российском Приамурье. Осиповская культура является древнейшей на земном шаре, и ее керамика отражает первые этапы становления гончарного производства в истории человечества. Керамика мариинской культуры характеризует следующий этап развития гончарства и относится к раннему неолиту на этой территории. Авторы приходят к выводу, что эти культуры оставлены разными в этнокультурном плане группами древнего населения. The paper describes results of the comprehensive study of pottery traditions through the prism of technological processes, shapes and ornamentation of vessels developed by the Osipovka and Mariinskoye Neolithic cultures in the Russian Amur Region. The Osipovka culture is the earliest on our planet and its pottery reflects first stages of pottery development in the history of humanity. The Mariinskoye pottery characterizes the next period of pottery development and is dated to the Early Neolithic of this region. The authors conclude that these cultures were left behind by different ethnocultural groups of the earliest population.

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1918 and the Habsburg Monarchy as Reflected in Slovak Historiography

Historical Studies on Central Europe ◽

10.47074/hsce.2021-2.08 ◽

2021 ◽

Vol 1 (2) ◽

pp. 206-229

Author(s):

Júlia Čížová ◽

Roman Holec

Keyword(s):

World War I ◽

Environmental History ◽

Social History ◽

Historical Memory ◽

Old Regime ◽

Habsburg Monarchy ◽

Left Behind ◽

History Of ◽

The Republic ◽

New Generation

With regard to the “long” nineteenth-century history of the Habsburg monarchy, the new generation of post-1989 historians have strengthened research into social history, the history of previously unstudied social classes, the church, nobility, bourgeoisie, and environmental history, as well as the politics of memory.The Czechoslovak centenary increased historians’ interest in the year 1918 and the constitutional changes in the Central European region. It involved the culmination of previous revisitations of the World War I years, which also benefited from gaining a 100-year perspective. The Habsburg monarchy, whose agony and downfall accompanied the entire period of war (1914–1918), was not left behind because the year 1918 marked a significant milestone in Slovak history. Exceptional media attention and the completion of numerous research projects have recently helped make the final years of the monarchy and the related topics essential ones.Remarkably, with regard to the demise of the monarchy, Slovak historiography has focused not on “great” and international history, but primarily on regional history and its elites; on the fates of “ordinary” people living on the periphery, on life stories, and socio-historical aspects. The recognition of regional events that occurred in the final months of the monarchy and the first months of the republic is the greatest contribution of recent historical research. Another contribution of the extensive research related to the year 1918 is a number of editions of sources compiled primarily from the resources of regional archives. The result of such partial approaches is the knowledge that the year 1918 did not represent the discontinuity that was formerly assumed. On the contrary, there is evidence of surprising continuity in the positions of professionals such as generals, officers, professors, judges, and even senior old regime officers within the new establishment. In recent years, Slovak historiography has also managed to produce several pieces of work concerned with historical memory in relation to the final years of the monarchy.

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Progress in the formalisation of the Anthropocene GSSP

10.5194/egusphere-egu21-3226 ◽

2021 ◽

Author(s):

Simon Turner ◽

Keyword(s):

Twentieth Century ◽

Human Activity ◽

Cultural Work ◽

Living History ◽

Max Planck ◽

Research Project ◽

Depositional Settings ◽

Quaternary Stratigraphy ◽

History Of ◽

Collaborative Exploration

The Anthropocene Working Group (AWG) has assembled scientific teams to analyse stratigraphic successions, as potential stratotypes, in order to facilitate a formal submission to the Subcommission on Quaternary Stratigraphy. The aim is to seek ratification of the Anthropocene as a geological epoch starting in the mid-twentieth century. Stratigraphic records, including a range of novel materials, geochemical and biological signals spanning the mid-twentieth century interval of unprecedented human activity and industrialisation, are being gathered by international teams of scientists, working on eleven contrasting depositional settings from around the planet. Interwoven with this scientific process to define a Global Boundary Stratotype Section and Point (GSSP), from which a specific year for the onset of the Anthropocene will be established, is a decades long collaborative exploration of the Anthropocene between the AWG, Haus der Kulturen Welt (HKW) and Max Planck Institute for the History of Science (MPIWG). &#160;While the compilation of stratigraphic data to define a new epoch is as old as the science of geology, the demarcation of one within living history that signifies human activity as a global geological agent is unparalleled. Similarly, there is no precedent of a stratigraphic formalisation process being pivotal to the framing of so much contemporary social, ecological, artistic, historical and political thought. In May 2022 along with the publication of the results and data, an exhibition including a discursive and performative programme will occur at HKW in Berlin as a public forum for the scientific, cultural and socio-political impact of the geochronological research carried out by the international research project on the Anthropocene.This presentation provides an introduction to the interdisciplinary and collaborative research project between the AWG, HKW and MPIWG. The talk will introduce the prospective sites and stratigraphy of the proposed successions and an update on progress towards the official ratification of the GSSP, as well as collaborative artistic and cultural work embedded in the process.

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