Tag Archives: Cenozoic

Global Paleoshoreline data

Together with former Ph.D. student Logan Yeo, we’ve reverse-engineered a set of global paleoshoreline compilations by Golonka et al. (2006) [1] and Smith et al. (1994) [2] and taken them back from the age of “dark data” being only published in analogue form, to fully digital versions. The paleoshoreline models are made available publicly in different formats, ready to be reconstructed with GPlates using different plate models. The data is published on the web alongside the paper (in press) in the Australian Journal of Earth Sciences (Heine, Yeo & Muller: Evaluating global paleoshoreline models for the Cretaceous and Cenozoic, Aust. J. Earth Sciences, in press) and they show the evolution of land area over time from ~150 Ma to the present according to the two different paleoshoreline estimates.

The files are available on my GitHub page here in *.gpml, *.geojson and *.shp format and can be viewed online. Unfortunately it doesn’t seem to be possible to embed the map on wordpress.com – I originally envisaged some funky webX.X embedded mapping here, but no. Instead web1.0 style links to follow for a sneak peek and some screenshots below:

  1. Golonka et al. (2006) models (examples):
  2. Smith et al. (1994) models:

The rendering through GitHub is fast and allows a quick overview about the global and regional paleoshoreline locations, allowing zooming in and panning.

Paleoshorelines in the Golonka model for the 139-123 Ma time slice rendered from a geojson file live on GitHub.

Paleoshorelines in the Golonka model for the 139-123 Ma time slice rendered from a geojson file live on GitHub. The colored area inside the polygon is equivalent to interpreted land (above sealevel) in the given time interval.

Another option to access the data is to use the version on CartoDB and interactively query and alter the data.

References:

[1] GOLONKA J., KROBICKI M., PAJAK J., VAN GIANG N. & ZUCHIEWICZ W. 2006. Global Plate Tectonics and Paleogeography of Southeast Asia. Faculty of Geology, Geophysics and Environmental Protection, AGH University of Science and Technology, Arkadia, Krakow, Poland.

[2] SMITH A., SMITH D. G. & FURNELL B. M.1994. Atlas of Mesozoic and Cenozoic coastlines. Cambridge University Press, 112 p. Cambridge, United Kingdom.

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Updated geological time scale color palettes

While it has been a little break over the summer on this blog, I have nevertheless been able to make a few updates related to the geological time color palettes (see this link for the original post). I have added the GTS2004 palettes (epochs and ages) and also the SEPM95 timescale. The color palettes (or *.cpt files) are designed for use with the Generic Mapping Tools (GMT) but can also be loaded in GPlates. On cpt-city, other formats are also available:

The gradients on cpt-city are usually available in each of the following file formats:

  • Generic Mapping Tools, GMT (cpt)
  • CSS3 gradients (c3g)
  • GIMP (ggr)
  • Gnuplot palette files (gpf)
  • POV-Ray colour map headers (inc)
  • PaintShop Pro’s native format (having the extension PspGradient), which can also be read by Photoshop (psp)
  • The SAO format DS9 (sao)
  • Scalar vector graphics gradients (svg)

Both palettes are still incomplete and require the extension back in geological time or adding eons or epochs. You can find the files on my BitBucket repository (https://bitbucket.org/chhei/gmt-cpts/). Any contribution to extend the individual files or add new timescales (or formats such as for QGIS) will be greatly appreciated!

The world in (geological) colors

The color palettes I described in my recent post can also be used with GPlates to color loaded features. Here are three examples which use the static polygon dataset which comes with GPlates. The first is using the GTS2012 chronostratigraphic time scale to color the static polygons by epoch and fill the polygons:

The world colored by geological epoch.

The world colored by geological epoch, filling the static polygons.

The second is just using the same data set and color the line features by geological era:

Coloring the polygons by era in GTS2012 colors.

Coloring the polygons by era in GTS2012 colors.

And the last is a bit Bauhaus-y by coloring everything in black and white according to the Gee & Kent geomagnetic polarity time scale (not that this would make a lot of sense, but as we can do it…):

The world in normal polarity and reverse polarity according to the Gee & Kent geomagnetic polarity timescale.

The world in normal polarity and reverse polarity according to the Gee & Kent geomagnetic polarity timescale (using the filled static polygons).

That planet looks way to boring -  hemispherical view of the Earth colored according to a normal (white) and reverse (black) geomagnetic polarity. Again using the Gee & Kent 2007 timescale.

That planet looks way to boring – hemispherical view of the Earth with the static polygons colored according to a normal (white) and reverse (black) geomagnetic polarity. Again using the Gee & Kent 2007 timescale.

In order to color loaded features by age (and timescale) just add the colorpalettes to the “Draw style” settings (Features -> Manage colouring) like this:

The geological age color palettes can be added to the Draw style (Manage colouring).

The geological age color palettes can be added to the Draw style (Manage colouring).

Once the new colour palettes are available, they can be assigned to the individual layers either through the layer window or through “Features -> “Manage colouring” .