Selected
publications and grants
Senior
Lecturer, Department of Earth Sciences, UCL
MSc
Micropalaeontology Course Director
Education
St.
Margarets High School Liverpool
Geology
BSc University of Sheffield
Micropalaeontology
PhD UCL
p.bown@ucl.ac.uk
www.es.ucl.ac.uk
+44
(0)20 7679 2431
Calcareous nannofossils - What are they?
Calcareous nannofossils are tiny
(micron-sized, i.e. measured in thousandths of a millimetre) fossil calcite
plates that formed the protective covering of marine phytoplanktonic (i.e.
photosynthesising, floating) algae. With diatoms and dinoflagellates, they are,
and were, the ‘grass’ of the oceans, i.e. important primary producers at the
base of the food web. These algae are still living in the oceans today and the
dominant group is called the coccolithophores. The fossil record contains many
examples of coccolithophores (see Emiliania
huxleyi and Watznaueria britannica,
below), but also includes extinct types that may or may not have been closely
related to the modern forms (see Schizosphaerella
punctulata, below).
As well as the inherent beauty of
calcareous nannofossils, they are of great importance for a number of different
reasons. Firstly, as oceanic primary producers, they play a key role in the
marine ecosystem, and in marine biogeochemical cycles as producers of organic
carbon, carbonate and dimethyl sulphide. Secondly, their calcareous skeletons
are incorporated into seafloor sediments, providing a remarkably complete
fossil record from the Late Triassic (225 Ma) to the present day. This fossil
record provides an excellent way in which to determine the age of rocks, using
biostratigraphy, but also gives an indication of the environments in which the
rocks were formed, thus informing ocean and climate history, and reveals
details of evolutionary patterns and processes.
On the left is a coccosphere (the complete
cell-wall covering) of the dominant living species, Emiliania huxleyi (each coccolith is about 4 microns) (seen from
space below, it even has its own web page http://www.noc.soton.ac.uk/soes/staff/tt/eh/), and on the right, a
nannofossil of uncertain biological affinities (because of its strange
morphology) from the Early Jurassic, called Schizosphaerella punctulata (each
bar on the image is 1 micron)
From left to right: atomic-scale view of Coccolithus pelagicus (image by Karen
Henriksen from Henriksen et al. 2004); Watznaueria
britannica (image Hiliary Dockerill) – was the most abundant Jurassic species;
a satellite image of innumerable living coccoliths in a bloom off NW Scotland
(image by ?NERC); innumerable fossil coccoliths (billions per square
centimetre) making up the chalk at Durdle Door, Dorset
My research career has focused on three
main themes of calcareous nannofossil science, namely: 1) the classification
and evolution of fossil representatives; 2) stratigraphic and biostratigraphic
applications; and 3) palaeoenvironmental/palaeoceanographic and palaeoclimate
applications.
1) The classification
and evolution of nannofossils
My PhD research comprised one of the first
comprehensive accounts of the early evolution and radiation of calcareous
nannofossils (Upper Triassic-Lower Jurassic), and provided a thorough taxonomic
account and preliminary phylogentic model for the initiation of Mesozoic
diversification. Building on this understanding of early diversification, I, in
collaboration with colleagues, have produced taxonomic guides and phylogenetic
models that incorporate Mesozoic, Cenozoic and extant nannoplankton. I have
also published on the diversity history of calcareous nannofossils, and records
for specific critical events, such as the Triassic/Jurassic and
Cretaceous/Tertiary boundary intervals. Other strands within this theme have
included work on the ultrastructure, crystallography and biomineralisation of
coccoliths, and the description of over 130 new species. Development of the V/R
model, explaining the crystallographic architecture of coccoliths and their
mode of intracellular growth, together with atomic forcing microscopy
observations of coccolith crystals, represent significant steps in our
understanding of these biogenic structures.
Phylogeny of coccolith families (after Bown et al. 2004)
An overview of current nannofossil taxonomy
is online at:
http://www.nhm.ac.uk/hosted_sites/ina/taxcatalog/INTRO.HTM
A guide to descriptive terminology is
online at:
http://www.nhm.ac.uk/hosted_sites/ina/terminology/index.htm
New species from the Palaeogene of Tanzania
(Bown 2005; Pearson et al. 2005)
2) Stratigraphic
and biostratigraphic applications
Stratigraphic work during my PhD provided
a new, refined biostratigraphic zonation scheme for the Lower Jurassic, which
was then expanded to incorporate the entire Jurassic System. A pioneering
stratigraphic study in southern Italy demonstrated the value of nannofossils in
Lower Jurassic sequences lacking ammonites. Following on from this,
biostratigraphic work was extended to encompass the Lower and Upper Cretaceous,
and in 1998 a complete stratigraphic synthesis volume was compiled, representing
a state-of-the-art nannofossil biostratigraphy handbook. The book contained new
and revised biostratigraphic zonation schemes for all stratigraphic intervals,
comments on zonal use, palaeobiogeography and evolution, and included over 2000
images representing much of the known nannofossil biodiversity. I have
published biostratigraphic research from the entire geological history of
nannofossils, as part of the Ocean Drilling Program, and other programs and
expeditions.
Calcareous nannofossil biostratigraphy
Ben Walsworth Bell standing at the
Triassic-Jurassic boundary at Pinhay Bay, Dorset. Jurassic rocks can be dated
using the nannofossil species below
Early Jurassic coccolith species: 1-2 Crepidolithus crassus, 3-4 Tubirhabdus patulus, 5-6 Parhabdolithus robustus, 7-8 Parhabdolithus liasicus (from Bown 1987)
3) Palaeoenvironmental
and palaeoceanographic applications
Calcareous nannoplankton are important
contributors to modern global biogeochemical cycles and, as such, record and
potentially drive environmental change. Like most plankton they are rather
insensitive to environmental parameters, living as they do throughout much of
the world ocean’s photic zone, and the challenge for nannopalaeontologists has
been to unlock the key to their use as environmental proxies. I have supervised
a number of students who have applied quantitative nannofossil assemblage data
approaches to palaeoenvironmental studies in the Jurassic and Cretaceous (Dawn
Windley, Ben Walsworth-Bell, Chris Street), and published studies addressing
Early Cretaceous palaeobiogeography and Jurassic, mid-Maastrichtian, K/T
boundary, and Miocene palaeoenvironments. Similar studies on mid-Cretaceous
oceanic anoxic events, the Paleogene/Eocene thermal maximum and the
Eocene/Oligocene boundary are in train (Tom Dunkley Jones).
Nannofossil
and other abundance data from the Cretaceous-Tertiary mass extinction level at
Shatsky Rise (NW Pacific) (after Bown 2005)
Markalius
inversus,
a Cretaceous survivor species (green), and Praeprinsius
sp., a tiny(-ier), newly evolved Paleocene species (pink), from the
lowermost Paleocene of Shatsky Rise (NW Pacific)
Abundance data
for the Cretaceous survivor species and newly evolving Paleocene species above
the Cretaceous-Tertiary boundary at Shatsky Rise (NW Pacific) (after Bown 2005)
Find out more about the Ocean Drilling
Program Leg 198 to Shatsky Rise at:
www-odp.tamu.edu/publications/198_IR/198ir.htm
Recent scientific activity
2005 The Paleobiology
Database, Micropalaeontology Workshop, Santa Barbara, CA, USA, February 2005 http://paleodb.org/cgi-bin/bridge.pl
2004 NSF Chronos Database Workshop, St. Petersburg, FL, USA, Oct.
2004 http://www.chronos.org/
2003 Coccolithophore
Biodiversity Workshop, Rutgers University, NJ, USA, December 16-17 2003
2003 Guest Editor for Marine Micropalaeontology (volume 52)
2002 Organising Committee
member, 6th International Symposium on the Jurassic System, Sicily,
Italy.
2002 Organising Committee
member, 9th International Nannoplankton Association Conference,
Parma, Italy
2001 Shipboard Scientist,
Ocean Drilling Program 198 (Shatsky Rise, NW Pacific Ocean)
Bown, P.R. 1998. Calcareous Nannofossil Biostratigraphy,
British Micropalaeontological Society Publication Series, Chapman and Hall
(Kluwer Academic Publishers): 1-315.
Bown, P.R., Lees,
J.A. & Young, J.R. 2004. Calcareous nannoplankton evolution and diversity.
In: H. Thierstein & J.R. Young (eds.)
Coccolithophores - From molecular processes to global impact, 481-508,
Springer-Verlag.
Bown, P.R. 1987.
Taxonomy, biostratigraphy, and evolution of late Triassic-early Jurassic
calcareous nannofossils. Special papers
in Palaeontology, 38: 1-118.
Bown, P.R.,
Cooper, M.K.E. and Lord, A.R. 1988. A calcareous nannofossil biozonation scheme
for the early to mid Mesozoic. Newsletters
on Stratigraphy, 20: 91-114.
Bralower, T.J.,
Bown, P.R. & Siesser, W.G. 1991. Significance of Upper Triassic
nannofossils from the Southern Hemisphere (ODP Leg 122, Wombat Plateau, NW
Australia). Marine Micropaleontology,
17: 119-154.
Baumgartner,
P.O., Bown, P.R., Marcoux, J., Mutterlose, Kaminski, M., Haig, D. & McMinn,
A. 1992. Early Cretaceous biogeographic and oceanographic synthesis of Leg 123:
Sites 765 and 766 (Argo Abyssal Plain) and lower Exmouth Plateau). Ocean Drilling Program, Scientific Results,
123: 739-758.
Young, J.R.,
Didymus, Bown, P.R., Prins, B. & Mann, S. 1992. Crystal assembly and
phylogenetic evolution in heterococcoliths. Nature,
356: 516-518.
Bown, P.R. 1992.
Late Triassic-Early Jurassic Calcareous Nannofossils of the Queen Charlotte
Islands, British Columbia, Journal of
Micropalaeontology, 11: 177-188.
Bown, P.R. 1993.
New holococcoliths from the Toarcian-Aalenian (Jurassic) of northern Germany. Senckenbergiana Lethaea, 73: 407-419.
Young, J.R. &
Bown, P.R. 1997. Higher classification of calcareous nannofossils. Journal of Nannoplankton Research, 19: 15-20.
Bown, P.R. &
Young, J.R. 1997. Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19: 21-36.
Young, J.R. &
Bown, P.R. 1997. Cenozoic calcareous nannoplankton classification. Journal of Nannoplankton Research, 19: 36-47.
Young, J.R. et
al. including Bown, P.R. 1997. Guidelines for coccolith and calcareous
nannofossil terminology. Palaeontology,
40: 875-912.
Young, J.R.,
Davis, S.A., Bown, P.R., & Mann, S. 1999. Coccolith ultrastructure and
biomineralisation. Journal of Structural
Biology, 126: 195-215.
Street, C. &
Bown, P.R. 2000. Palaeobiogeography
of Early Cretaceous (Berriasian-Barremian) calcareous nannoplankton. Marine Micropaleontology, 39: 265-291.
Bralower, T.J.,
Premoli-Silva, I., Malone, M.J. & Ocean Drilling Program Leg 198 Shipboard
Party including Bown, P.R. 2002. Ocean Drilling Program Leg 198 Preliminary
Report. Extreme Warmth in the Cretaceous and Paleogene: a depth transect on
Shatsky Rise, Central Pacific (27 August-23 October 2001). www-odp.tamu.edu/
publications/prelim/198_prel/198toc.html
Henriksen, K.,
Young, J.R., Bown, P.R., & Stipp, S.L.S. 2004. Coccolith biominerlization
studied with Atomic Force Microscopy. Palaeontology,
47: 725-743.
Bown, P.R. &
Concheyro, A. 2004. Lower Cretaceous nannoplankton from the Neuquén Basin,
Argentina. Marine Micropalaeontology,
52: 51-84.
Pearson, P.,
Nicholas, C.J., Singano, J., Bown, P.R., Coxall, H.K., van Dongen, B.E., Huber,
B.T., Karega, A., Lees, J.A., Msaky, E., Pancost, R.D., Pearson, M. &
Roberts, A.P. 2004. Paleogene and Cretaceous sediments cores from from the
Kilwa and Lindi areas of coastal Tanzania: Tanzania Drilling Project Sites 1 to
5. Journal of African Earth Sciences,
39: 25-62.
Lees, J.A., Bown,
P.R. and Young, J.R. 2004. Evidence for annual records of phytoplankton
productivity in the Kimmeridge Clay Formation coccolith stone bands (Upper
Jurassic, Dorset, UK). Marine
Micropaleontology, 52: 29-49.
Robinson, S.,
Williams, T. & Bown, P.R. 2004. Fluctuations in biosiliceous production and
generation of Early Cretaceous oceanic anoxic events in the Pacific Ocean
(Shatsky Rise, ODP Leg 198). Paleoceanography,
19: PA4024, doi:
10.1029/2004PA001010, 2004.
Frank, T.,
Thomas, D., Leckie, M., Arthur, M., Bown, P.R., Jones, K. & Lees, J.A.
2005. The Maastrichtian record from Shatsky Rise (northwest Pacific): a
tropical perspective on global ecological and oceanographic changes. Paleoceanography, 20: PA1008, doi: 10.1029/2004PA001052, 2005.
Bown, P.R. 2005.
Paleogene calcareous nannofossils from the Kilwa and Lindi areas of coastal
Tanzania: Tanzania Drilling Project Sites 1 to 10. Journal of Nannoplankton Research, 27: 21-95.
Bown, P.R. 2005.
Selective calcareous nannoplankton survivorship at the Cretaceous-Tertiary
boundary. Geology, 33/8: 653-656.
Bown, P.R. In press. Early to mid-Cretaceous
calcareous nannoplankton from the northwest Pacific Ocean (ODP Leg 198). In
Bralower, T.J., Premoli Silva, I., and Malone, M.J. (Eds.), Proceedings of the Ocean Drilling Program,
Scientific Results, 198
[Online]. Available from World Wide Web: <http://www-odp.tamu.edu/
publications/198_SR/103/103.htm>.
Bown, P.R. In press. Calcareous nannoplankton
evolution: a tale of two oceans. Micropaleontology.
Wade, B. &
Bown, P.R. Accepted with revision.
Calcareous nannofossils in extreme environments: The Messinian Salinity Crisis,
Polemi Basin, Cyprus. Palaeogeography,
Palaeoclimatology, Palaeoecology
2005-2008 NERC - Exploiting a
novel technique to extract biological and ecological information from fossil
calcareous nannoplankton: £262,189 PI
2004-2007 NERC - Do Paleogene sediments in
the Andaman Flysch, Sylhet Trough and Iranian Makran record early erosion of
the Himalayas? PI Dr. Andy Carter (Birkbeck): £167, 836 CO
2002-2005 NERC - Double proxy
investigation of Cretaceous and Paleogene CO2 levels, Tanzania. : £257,695 PI Prof. Paul Pearson and
others (Cardiff), Contributor
1996-1998 NERC - Phytoplankton dynamics and
environmental cycles in the Late Jurassic (Kimmeridge Clay Formation, UK) PI
with Dr. J.R. Young (NHM) and Dr. J. Riding (BGS)
1993-1995
NERC - Coccolith phylogeny and patterns of evolution using new morphological
and crystallographic methods of analysis (NERC Standard Grant GR3/8496). PI
With Dr. J.R. Young (NHM) and Dr. N. Ross (UCL)
MSc
Micropalaeontology Calcareous Nannofossil Module
A three- to four-week (35-40 lectures, 40
practicals) module taught as part of the Micropalaeontology MSc. The course is
internationally unique in providing extensive postgraduate training in a
fossil-extant group that is widely utilised in Earth Sciences and the
hydrocarbon exploration industry. The course covers all aspects of the biology,
palaeobiology and evolutionary/stratigraphic history of calcareous
nannofossils.
B163 History of
Life (see link to webpage below)
This half course-unit course (20 lectures,
8 practical classes) gives an account of the development of life on Earth and
the way in which life and the physical environment have interacted through 3800
million years of Earth’s history. The course begins with the formation of the
Solar System and goes on to discuss the origins and development of life and the
planet through the Precambrian and Phanerozoic. The course includes
introductions to all aspects of palaeontology - palaeobiology, biostratigraphy,
evolution, palaeoecology and taxonomy - and practical classes cover the
description and classification of major invertebrate fossil groups, and the
manipulation and application of palaeontological data.
In both courses, there is a common
teaching philosophy, stressing the academic, economic, environmental and
cultural impacts of palaeontology and palaeobiology. Economically and
academically, palaeontology has been at the forefront of the development and
refinement of the geological timescale, providing the underlying framework for
all of our understanding of Earth history, and, practically, the chronology for
economic deposits exploration. Living and fossil organisms are also fundamental
in the tracking of global environmental change that has profoundly influenced
the way in which we view Earth history, revealing both catastrophic (e.g. mass
extinctions) and gradual (e.g. biotic response to greenhouse-icehouse climate
mode transitions) change. Culturally, palaeontology provides a unique context
for humans and society, with respect to the remaining life on Earth and the planet
itself – a fact clearly evidenced by society’s continuing fascination with all
aspects of past life on Earth and other planets, most obviously with dinosaurs
but actually reaching across the diversity of life.
Degree Course Director:
2002-Present: MSc Micropalaeontology
LINK
1999-2002: BSc/MSci
Palaeobiology
1991-1996: BSc
Geology
Course Organiser:
1989-Present: Calcareous Nannofossils – three- to
four-week (35-40 lectures, 40 practicals) module as part of the
Micropalaeontology MSc
http://www.es.ucl.ac.uk/graduate/micropal/UCL-NHM_MSc.html
Foraminifer
covered with nannofossils – scale bars are 100 microns
1992-Present: B163 History
of Life – first year half course-unit
http://www.es.ucl.ac.uk/undergrad/courses/B163/B163home.html
Left,
dinosaur trackway near Moab, Utah (Jackie Lees for scale); right, Jurassic
ammonites in Argentina
1993-Present: B176 Southwest England Field Course –
first year field class (10 days)
http://www.earthsciences.ucl.ac.uk/undergrad/fieldwork/image/fieldtrips/SWEngland/SWEnglandfl.html
First year
undergraduate fieldcourse (~40-50 students) that introduces all aspects of
field geology, including historical geology, stratigraphy, sedimentology,
palaeontology, and igneous and metamorphic rocks
Left,
Blue Lias ammonites, looking east along the Jurassic Coast from Lyme Regis,
Dorset; right, at least the under-4s are listening to the geological history of
Cornwall!, at Ledden Cove
photo
album at
http://www.es.ucl.ac.uk/undergrad/fieldwork/FieldTrips/SWEngland/INDEX.HTM
2003-Present: MSc Micropalaeontology Field Training Course
(4-7 days)
Postgraduate fieldcourse
to Cyprus, Spain or the Isle of Wight, which includes geological problem
solving, sedimentary logging and field collection of micropalaeontological
samples
2000-Present: B231 Isle of Wight Field Course - second
year Palaeobiology field class (4 days)
Second
year undergraduate fieldcourse teaching palaeontological field techniques
1992-2001: C6 Independent
Mapping Project – third year course-unit (14 days +)
Second/third year
undergraduate field mapping course to the Cantabrian Cordillera, northern
Spain, which precedes their 6-week independent mapping project. The area
comprises a tectonised early Palaeozoic shallow marine succession.
1992-2000: C412 Micropalaeontology – third year
half course-unit
2000-2003: B275 Geoscience Report – second year
half course-unit
2003 Maths
and Physical Sciences (MAPS) Faculty Teaching Award
2001-Present Member of
the Geological Society Stratigraphy Commission
http://www.geolsoc.org.uk/template.cfm?name=geohome
2000-Present Editor of
the Journal of Nannoplankton Research,
Special Publications
http://www.nhm.ac.uk/hosted_sites/ina/
1999-Present Secretary of
the International Subcommission on Jurassic Stratigraphy LINK
1995-Present Member of
the Palaeontological Association http://palass.org/index.html
1989-Present Co-editor of
the Journal of Nannoplankton Research 1986-Present
1995-Present
1989-Present Council
Member, International Nannoplankton Association
1986-Present Member of
The Micropalaeontological Association (Council member 1988-1990)
http://www.nhm.ac.uk/hosted_sites/tms/
A few links
Champions
of Europe 2005
Best
bands in the world
http://www.handsomefamily.com/
actually,
too many to mention
INA –
International Nannoplankton Association http://www.nhm.ac.uk/hosted_sites/ina/
Miracle
– some microfossil images from UCL Micropalaeontology
http://www.ucl.ac.uk/GeolSci/micropal/index.html
http://www.nhm.ac.uk/hosted_sites/ina/
UCL
Earth Sciences http://www.es.ucl.ac.uk/
KCRW
radio http://www.kcrw/
Last
revised: August 2005