Mark W Hounslow

Mark W Hounslow
Lancaster University | LU · Lancaster Environment Centre

PhD

About

152
Publications
35,726
Reads
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3,302
Citations
Introduction
My main interest is in magnetic geochronology at a variety of times scales- from archaeological to geological. Current interests are in the Anthropocene, Pliocene/Miocene, Triassic, Lower Carboniferous, Silurian-Ordovician. I have also focused on sediment tracing from source to sink studies, interpreting magnetic proxies for understanding environmental change in sediment and soil records, and sediment micro and macrofabric for environmental interpretation.
Additional affiliations
July 2000 - June 2020
Lancaster and Liverpool Universities
Position
  • Fellow

Publications

Publications (152)
Article
The degree to which emergent surfaces are correlated in late Asbian carbonate successions in Britain and Ireland is assessed by the integration of detailed biostratigraphy and diversity trends in foraminifers. Data are related to the Trowbarrow Quarry section in northern England, which provides a reference section for the upper Asbian because of it...
Article
Full-text available
The Devonian has long been a problematic period for paleomagnetism. Devonian paleomagnetic data are generally difficult to interpret and have complex partial or full overprints– problems that arise in data obtained from both sedimentary and igneous rocks. As a result, the reconstruction of tectonic plate motions, largely performed using apparent po...
Article
Full-text available
A detailed magnetostratigraphic study, linked to a new latest Permian U-Pb ID-TIMS age, was undertaken on the continental Shichuanhe section (SCH) in North China in order to provide a magnetic polarity scale for the Late Permian-early Middle Triassic interval. Tilt-corrected mean directions of the characteristic remanent magnetization pass the reve...
Article
Despite the importance of south Cumbrian sections for the Arundian–Holkerian (mid Viséan) boundary, beyond the stratotype proposed at Barker Scar in 1976, little else is known regionally about this boundary and its relationship to adjacent formations. We re-evaluate the Dalton Formation, making its upper and lower boundaries regionally more consist...
Article
A detailed biostratigraphy is established, using the high foraminiferal abundance and diversity at Trowbarrow Quarry, which is also proposed as a stratotype section for the late Asbian (late Visean), a substage not previously formally subdivided. The foraminiferal assemblages suggest that the early Asbian has to be revised, which has implications f...
Preprint
Geophysical techniques have been widely employed for the noninvasive location of burial sites in archaeological and forensic investigations. This approach has met with varying degrees of success, depending on factors such as equipment choice, survey methodology, burial type, and geological setting. This paper reports the results of a multitechnique...
Article
Foraminiferal revision of the Holkerian Stratotype of Britain at Barker Scar, Holker Hall, south Cumbria, UK, allows the subdivision of the section into the Cf4δ, Cf5α and Cf5β subzones (the latter being further subdivided into a lower Cf5β1 and upper Cf5β2 intervals). The base of Cf5α subzone at the base of bed C and base of Cf5β subzone from the...
Article
Full-text available
The age of the beginning of magnetic polarity Chron M0r, a proposed marker for the base of the Aptian Stage, is disputed due to a divergence of published radioisotopic dates and ambiguities in stratigraphic correlation of sections. Our magnetostratigraphy of core DH1 from Svalbard, Norway, calibrates a bentonite bed, dated by U-Pb methods to 123.1...
Article
Widespread marine red beds in the European Telychian (lower-Silurian) are one expression of an interval of unusually widespread oxic conditions in low palaeolatitude Silurian seas. This work examines in detail the geochemical and magnetic susceptibility record of cores from southern Poland, which also express the Telychian oxygenation event in grey...
Article
Magnetostratigraphic studies in the Silurian are absent, and what is understood about the geomagnetic polarity during this time is based on polarity bias-type data from palaeopole-type studies. We provide the first composite magnetic polarity record through the Lower Silurian (Llandovery) from the magnetostratigraphy of six sections. These are inte...
Article
Magnetostratigraphic studies of the Ordovician provide evidence for the nature of core-mantle boundary interactions, and provide means for dating and correlation across differing environmental regimes. We provide new magnetostratigraphic data from the Middle and Upper Ordovician, compiling this into a polarity chronostratigraphic scale for the Dapi...
Code
The program and code here is a port DOSBox version of the software originally written by Kent, Briden and Mardia (1983), which fits lines and planes to demagnetisation data. The analysis is a more sophisticated version of the conventional Kirschvink principle component style of analysis. The port to DosBox has some additional Fortran and C code to...
Article
The geomagnetic polarity pattern for the Carboniferous is incompletely known, but with the best resolved parts in the Serpukhovian and Bashkirian. Hence, data from both igneous and sedimentary units are also used in an additional polarity bias evaluation. In the Tournaisian to mid Visean interval polarity is mainly derived from palaeopole-type pala...
Article
Full-text available
Terrestrial and lacustrine Neogene and Quaternary sediments in the Libyan Fezzan provide key evidence for paleoclimate changes in the central Sahara, associated with Lake Megafezzan. Understanding of Holocene and late Pleistocene deposits is resolved, but the age of older sediments is not. We provide the first high-resolution chronology and stratig...
Article
Full-text available
We propose a novel method to evaluate regional palaeoclimate that can be used to alleviate the problems caused by the discontinuous nature of palaeoenvironmental data found in deserts. The technique involves processing satellite imagery and DEM's to map past rivers, catchments and evaluate the areas and volumes of palaeolakes. This information is u...
Chapter
Full-text available
Chronostratigraphy is both a set of stratigraphic concepts, and a set of guiding principles by which time represented in rocks, subdivides Earth's geological history. Chronostratigraphy is composed of a set of hierarchical stratigraphic units (i.e. System, Series, Stage, Substage and Chronozone for chronostratigraphic units) that are used to subdiv...
Code
GM4Edit is a program to manage, manipulate, plot and export palaeomagnetic magnetometer files. In this version, GM4Edit (v.5.6) does the following: A) The modification of existing magnetometer data sets and creation of new magnetometer data sets, B)The importing of magnetometer data from various kinds of instruments (RAPID 2G, JR6), with options fo...
Poster
Full-text available
We studied two partly overlapping sections in limestones in southern Cumbria, to constrain a magnetostratigraphy through most of the Visean (Fig. 1, 4) (early Carboniferous), Meathop quarry and Trowbarrow quarry. The Visean in this area is roughly 650 m thick and is composed of grainstones, packstones and wackestones, with minor amounts of shale. A...
Poster
Full-text available
Summarize the results from Cumbria, on 2 sites: Meathop and Trowbarrow quarry, the Magnetic measurements on Carboniferous limestones.
Article
Full-text available
Abstract Decades of geochronological work have shown the temporal distribution of zircon ages to be episodic on billion-year timescales and seemingly coincident with the lifecycle of supercontinents, but the physical processes behind this episodicity remain contentious. The dominant, end-member models of fluctuating magmatic productivity versus sel...
Article
Full-text available
We propose a novel method to evaluate regional palaeoclimate that can be used to alleviate the problems caused by the discontinuous nature of palaeoenvironmental data found in deserts. The technique involves processing satellite imagery and DEM's to map past rivers, catchments and evaluate the areas and volumes of palaeolakes. This information is u...
Article
Full-text available
The generally arid Late Triassic climate was interrupted by a wet phase during the mid-Carnian termed the Carnian Pluvial Episode (CPE). Quantitative palynological data from the Mercia Mudstone Group in the Wessex Basin (UK) reveal vegetation changes and palaeoclimate trends. Palynostratigraphy and bulk organic carbon isotope data allow correlation...
Article
Full-text available
Ascertaining the cause of variations in the frequency of geomagnetic polarity reversals through the Phanerozoic has remained a primary research question straddling paleomagnetism and geodynamics for decades. Numerical models suggest the primary control on geomagnetic reversal rates on 10 to 100 Ma timescales is the changing heat flux across the cor...
Chapter
Full-text available
Particulate matter derived from various sources of fuel combustion contains minor-to-trace amounts of Fe oxides that can be detected by magnetic measurements. These magnetic particulates can be used as proxies for particulate pollution, since oxide contents are often larger in amounts and may have distinctive magnetic properties, compared with most...
Article
Full-text available
The reverse polarity Kiaman Superchron has strong evidence for at least three, or prob ably four, normal magnetochrons during the early Permian. Normal magnetochrons are during the early Asselian (base CI1r.1n at 297.94+0.33 Ma), late Artinskian (CI2n at 281.24+2.3 Ma), mid-Kungurian (CI3n at 275.86+2.0 Ma) and Roadian (CI3r.an at 269.54+1.6 Ma). T...
Article
Full-text available
Terrestrial and lacustrine Neogene and Quaternary sediments in the Libyan Fezzan provide key evidence for paleoclimate changes in the central Sahara, associated with Lake Megafezzan. Understanding of Holocene and late Pleistocene deposits is resolved, but the age of older sediments is not. We provide the first high-resolution chronology and stratig...
Code
Sequence slotting is a method of objective correlation between two successions of data. The aim of sequence-slotting is to optimally ‘slot’ (interleave or align) two ordered sequences of data in such a way that the overall discordance (or discrepancy) in the combined slotted sequence is minimized. For example, the data sequences could arise from tw...
Article
Full-text available
Long intervals of single geomagnetic polarity (superchrons) reflect geodynamo processes, driven by core-mantle boundary interactions; however, it is not clear what initiates the start and end of superchrons, other than superchrons probably reflect lower heat flow across the core-mantle boundary compared with adjacent intervals. Here geomagnetic pol...
Data
Excel file with source data, and notes on its use
Data
Supplementary Figures 1-8, Supplementary Tables 1-11, Supplementary Note 1 and Supplementary References
Article
Full-text available
The chronology of Permian strata in SW England is fragmentary and largely based on radiometric dating of associated volcanic units. Magnetostratigraphy from the c. 2 km of sediments in the Exeter and Aylesbeare Mudstone groups was undertaken to define a detailed chronology, using the end of the Kiaman Superchron and the overlying reverse and normal...
Article
Full-text available
New data are presented in relation to the worldwide definition of the Oxfordian/Kimmeridgian boundary, i.e. the base of the Kimmeridgian Stage. This data, mostly acquired in the past decade, supports the 2006 proposal to make the uniform boundary of the stages in the Flodigarry section at Staffin Bay on the Isle of Skye, northern Scotland. This bou...
Article
Full-text available
The Late Triassic climate is characterized by arid conditions interrupted by a humid phase known as the Carnian Pluvial Event (CPE). This wet phase is well documented in the Tethyan realm, but evidence from the Boreal realm is scarce. Here we present evidence from quantitative palynology for the CPE from the Kapp Toscana Group on central Spitsberge...
Article
The Late Triassic climate is characterized by arid conditions interrupted by a humid phase known as the Carnian Pluvial Event (CPE). This wet phase is well documented in the Tethyan realm, but evidence from the Boreal realm is scarce. Here we present evidence from quantitative palynology for the CPE from the Kapp Toscana Group on central Spitsberge...
Article
Full-text available
Hopen is a solitary island of Upper Triassic strata in the southeastern most corner of the Svalbard archipelago. Outcrop studies throughout the island, supported by palynology, magnetostratigraphy and geological modelling have led to the identification of a new member unit within the upper part of the De Geerdalen Formation, the Hopen Member. Based...
Chapter
Geomagnetic and mineral magnetic data provide geological indices that are both independent of human impact (i.e. geomagnetic) and respond to human-induced environmental impact (i.e. mineral magnetic). We provide the first discussion of such magnetic events for help in defining the Anthropocene. Within the Holocene, a potential geomagnetic marker fo...
Article
Full-text available
Procedures used to define an international chronostratigraphic stage boundary and to locate and ratify a Global Boundary Stratotype Section and Point (GSSP) are outlined. A majority of current GSSPs use biostratigraphic data as primary markers with no reference to any physico-chemical markers, despite the International Subcommission on Stratigraphi...
Article
Full-text available
An integrated heavy mineral, mineral chemical and zircon dating study of the mid-Triassic succession on the south Devon coast, in the western part of the Wessex Basin indicates derivation from a combination of granitic and metasedimentary lithologies of age mostly older than 550 Ma. These source regions were located at a relatively proximal locatio...
Article
Full-text available
We present results of detailed paleomagnetic investigations on deep-sea cores from sediment drifts located along the Pacific continental margin of the Antarctic Peninsula. High-resolution magnetic measurements on u channel samples provide detailed age models for three cores collected from drift 7, which document an age of 122 ka for the oldest sedi...
Article
Full-text available
The Anthropocene, an informal term used to signal the impact of collective human activity on biological, physical and chemical processes on the Earth system, is assessed using stratigraphic criteria. It is complex in time, space and process, and may be considered in terms of the scale, relative timing, duration and novelty of its various phenomena....
Article
Full-text available
We present results of detailed paleomagnetic investigations on deep‐sea cores from sediment drifts located along the Pacific continental margin of the Antarctic Peninsula. High‐resolution magnetic measurements on u channel samples provide detailed age models for three cores collected from drift 7, which document an age of 122 ka for the oldest sedi...
Article
Full-text available
This paper reports the results of fieldwork conducted in the 2010 and 2011 DMP field seasons and of analysis of samples collected during these and previous years. Research has involved 1) studying palaeolake sediment outcrops, 2) using ground penetrating radar (GPR) to determine their extent under the Dahān Ubārī, and 3) coring palaeolakes in order...
Article
Geophysical techniques have been widely employed for the noninvasive location of burial sites in archaeological and forensic investigations. This approach has met with varying degrees of success, depending on factors such as equipment choice, survey methodology, burial type, and geological setting. This paper reports the results of a multitechnique...
Article
Full-text available
Studies of Triassic magnetostratigraphy began in the 1960s, with focus on poorly fossilferous nonmarine red-beds. Construction of the Triassic geomagnetic polarity timescale was not consolidated until the 1990s, when access to magnetometers of sufficient sensitivity became widely available to measure specimens from marine successions. The biostrati...
Article
Full-text available
A magnetic polarity pattern for Boreal and Sub-Boreal ammonite zones of the Upper Oxfordian to Lower Kimmeridgian was established and confirmed in four British sections, including the proposed Global Boundary Stratotype Section and Point (GSSP) on the Isle of Skye (Scotland) to define the base of the international Kimmeridgian Stage. A coeval patte...
Article
A magnetostratigraphic study was performed on the lower 44 m of the West Pingdingshan section near Chaohu city, (Anhui province, China) in order to provide a magnetic polarity scale for the early Triassic. Data from 295 paleomagnetic samples are integrated with a detailed biostratigraphy and lithostratigraphy. The tilt-corrected mean direction from...
Article
Full-text available
The January 2009 fieldwork season conducted geomorphological and palaeoenviromental surveys in as yet unexplored parts of the Lake Megafazzan Basin, as well as continuing research in the Wadi al-Hayat and Ubari Sand Sea. Lake Megafazzan sediments were investigated at two sites on the eastern margin of the basin. At the first site, east of Tamessah,...
Article
Full-text available
Permian and Triassic sediments from Svalbard provide a testing ground for evaluating concepts about the polarity and configuration of the geomagnetic field during the Palaeozoic–Mesozoic transition. This review examines existing palaeomagnetic and magnetostratigraphic data, and also re-examines the issue of partial remagnetization of these sediment...
Article
Full-text available
Conodont faunas are described from Triassic sections of Svalbard, and their occurrences are locally correlated with established ammonoid zones. With a synthesis of previous conodont-based publications, the current work presents a taxonomically up-to-date compilation of conodont data for the Triassic of Svalbard that is used to construct a conodont-...
Article
An integrated biomagnetostratigraphic study of the latest Early Triassic to the upper parts of the Middle Triassic, at Milne Edwardsfjellet in central Spitsbergen, Svalbard, allows a detailed correlation of Boreal and Tethyan biostratigraphies. The biostratigraphy consists of ammonoid and palynomorph zonations, supported by conodonts, through some...