10.5061/DRYAD.1779G
Holland, Steven M.
University of Georgia
Christie, Max
University of Georgia
Data from: Changes in area of shallow siliciclastic marine habitat in
response to sediment deposition: implications for onshore-offshore
paleobiologic patterns
Dryad
dataset
2013
sequence stratigraphy
sea level
Marine
2013-04-12T18:32:13Z
2013-04-12T18:32:13Z
en
https://doi.org/10.1666/12053
9759 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
Models presented here of shallow-marine siliciclastic deposition show that
the widths of depth-defined regions differ markedly in response to
sea-level change. These models add to recent studies that have emphasized
the highly specific response of habitat area to sea-level change.
Collectively, these studies indicate that a particular bathymetric zone on
a particular margin may vary substantially in area during a sea-level
change, while other such zones and margins may experience little or even
opposite responses. In the models presented here, intermediate- depth and
deep-water regions tend to show sinusoidal variations in width, with
widening during relative falls in sea level and narrowing during relative
rises. The shallow-water region displays markedly non-sinusoidal change
and is consistently characterized by abrupt widening at the beginning of
the highstand systems tract and an equally abrupt narrowing at the onset
of sea-level fall at the beginning of the falling-stage systems tract.
These onshore-offshore differences in how width and area change with sea
level may explain why taxa in shallow- water settings tend to be more
abundant, eurytopic, and widespread than those in deeper-water settings.
Likewise, these models suggest that the evolution of novelty in nearshore
habitats may be a response to wide variation in shallow-marine area during
sea-level change.
R and Matlab code for Holland and Christie 2013Contains R and Matlab
functions for simulating and measuring the changes in the width of
depth-defined zones during changes in sea
levelHollandChristieSupplementaryMaterials.rtf