My research: the spirals on the shale

I often get asked what my research is about. I hope the post below sheds some light on what I do!

It’s the summer, 320 million years ago. Deep underwater, a tiny tentacle-bearing creature retreats into its spiral shell. Suddenly, a tremor! Organisms scurry for their lives. Soon after, a huge submarine landslide shakes the sea floor all around. Who will survive? Why, fossils of course!

Nautilus, a distant relative of goniatites (source:

Nautilus, a distant relative of goniatites (source:

Fossil goniatites have an fascinating story to tell. Technically defined as members of the order Goniatitida, goniatites are extinct cephalopods ranging from the middle of the Devonian to the end of the Permian.

Related to squid and cuttlefish, these animals were very diverse in terms of size, shape and sculpturing. They had an external shell, divided internally into several chambers. The animal resided in the last formed chamber, the body chamber.

The distribution of goniatites in space and time is better known than their biology. In fact, the pearly Nautilus is the only known living descendant of externally shelled cephalopods. But, however tempting it may be to draw palaeoecological inferences from Nautilus, it must be noted that it is not phylogenetically closely related to goniatites.

Goniatites are a prime tool in biostratigraphy, since they evolved rapidly and achieved widespread distribution. The fossil remains of these marine-dwelling organisms are mostly found concentrated in dark shale horizons in the Carboniferous Shannon Basin, Western Ireland.


Inspecting the shale bands in the Ross Sandstone Formation, Loop Head Peninsula, Co. Clare, Ireland.


Here, the organic-rich shales contain a mixed fauna, including goniatites and bivalves. Each band has a distinctive faunal assemblage, usually with a dominant goniatite species, that allows correlation within the basin.

For instance, the index fossils employed in the biostratigraphy of the Ross Sandstone, which crops out mainly in the Loop Head Peninsula, Co. Clare, Ireland, are: Phillipsoceras paucicrenulatum, Phillipsoceras circumplicatile, Vallites henkei and Homoceratoides prereticulatus.

My current research in Trinity College Dublin aims to develop a detailed and coherent biostratigraphic framework for the Ross Sandstone Formation, a succession of deep-water turbidites which has proven to be an instructive analogue for oil and gas-bearing sequences elsewhere.


External mould of Phillipsoceras circumplicatile, Loop Head Peninsula, Western Ireland.


Tagged , ,

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

Exploring the Earth

The earth science behind some amazing places


What I talk about when I talk about science!

Letters from Gondwana.

Paleontology, books and other stuff.


Situated in Martello Tower North #2 in Howth, Co. Dublin...

Rick O'Shea

RTE Broadcaster, Book Pusher, Event Host

The Places You'll Go

Bits and pieces of my life

Science Spinning

An Irish 'spin' on science

On The Rocks

Geological News & Views


Simon Goring's research page & blog

TED Blog

The TED Blog shares news about TED Talks and TED Conferences.

The Past and Present Future

Ken Hinckley's Ideas, Visions, and Opinions on the Research Frontiers of Human Technologies

%d bloggers like this: