Fieldwork Photo of the Week

Northern Alay Chain, Batken District, SW Kyrgyzstan.

Standing on massive Devonian limestones we are looking to the NNW. On the right you can see the greenish Madygen river oasis bearing a few farms and fruit plantations. On the left: the badlands represent the SW outcrop area of the Triassic Madygen Formation.

To the north and northwest reddish strata and ribs of Cretaceous conglomerate follow which overlie a narrow stripe of Jurassic. Than there is a succession of mostly Cenozoic rocks forming the core of a syncline.

In the distance you can see larger massifs of mostly Paleozoic schists, limestones and conglomerates. And then there is the greenish plain to the northwest marking another outcrop of fineclastic sediments.

This is Dzhaylyau-Cho ("good meadow"), the NW outcrop area of the Madygen Fm, including "Sharov Quarry" as the most famous locality for insects and tetrapods.


Can you see the artificial band-like wall to the west of the Madygen oasis - this is some relic from ancient times (built under Alexander the Great according to a myth).

Fieldwork Photo of the Week

Two pix from the field camp:

The clubroom buildung, now fully erect and in use. In green: Our cook Ludmilla from Osh.

The penultimate act of packing and repacking one day before the end of the expedition.

Constructivist geoscience and what we can learn from the financial crisis

The analyses are done. Because you are supposed to do an 'integrated approach' you are working on 'integrating' your data and doing an interpretation that fits in with everything.

After a short or long search for patterns (as a geologist you are at least talented in pattern-spotting), you will find that no easy existing model fits with all data (or worse: every existing model fits with all data) which gives you the chance to chose the model you like best and alter it a bit. You are using an auxilliary hypothesis which explaines why this model, which is adequate in general, is not working properly for the data you are involving.

The best ist to raise a whole set of model assumptions which are not easy to be proven or disproven. Imagine it as a daughter company, to which you can export your credit risks in order to keep the bilance of your adapted existing model clean.

If there are some new data that appear to falsify your model you are employing your daughter company of auxilliary theses to explain why they are not at all problematic.

Given your business concept is good you even manage to invert contradicting data - under the light of your additional theses they actually support your model.

As you can handle it flexibly, you can of course add to or remove from the stock of your daughter company at free will. A good idea is to pay attention to fashions (if 'Milankovich cycles' or 'metamorphic core complexes' or 'climate change' are en vogue you may think about including them).

Successful model constructors manage to give their constructs the appearance of inner coherence (e.g. by means of categories, definitions and a quantitative bluff package) and sell them to others who 'succesfully' convert them to new areas and problems.

And then everything collapses - some new conflicting data pushes your model to the point of absurdity. Usually the new data fit in with a much more parsimonious alternative model. And no one will understand how you could have been so stupid to overlook that possibility in the first place...

Fieldwork Photo of the Weak

The Neverending Outcrop: Younger stratigraphic succession near Madygen, SW Kyrgyzstan.
The greyish-brownish Madygen Formation is overlayn uncomformably by varicoloured continental Jurassic strata which in turn are separated by an uncomformity from reddish deposits of the facially diverse Cretaceous including massive conglomeratic banks.


Paleogene: A yellowish marine succession containing mass occurrences of oysters and massive carbonates is followed by younger continental deposits of the Tertiary.

Note the roofs of premises belonging to the village of Madygen.

Tectonics & Paleo (III):The shearing of fossils and how to reverse it

Let's start in 2D: You have a flat fossil and regard only the deformation in the two dimensions of the fossil plane:


Easy, you may say. Fossils specimens like that are good strain indicators and it's not difficult to deduce the amounts of simple shear and flattening/lengthening necessary to transform the undeformed into the deformed specimens or vice versa:


There was a story, my tectonics prof told me from his study time when he was working for a famous German paleontologist: He was doing the retrodeformation of fossils using some kind of algorithm/ computing procedure - but only, until his sponsor found that he could reach the same effect by holding the fossil oblique over a photocopying machine (you can imagine what a disillusionment that was...).

In some cases, however, the problem is not as simple as in the example displayed above. Insect wings from Madygen and other localities often display a considerable amount of deformation but occur isolated and as palaeontological samples they have not been taken oriented (i.e. referenced to a system of external coordinate axes).



What was the original shape?

This question is crucial if you want to define and distinguish taxa (how many unnecessary species have been erected because the similarity of fossil specimens got lost in deformation?) but also searching for intraspecific variation, e.g. branching points that are highly variable in individuals of the same species.

My "bureau-mate" Olivier Bethoux, paleoentomologist, is currently doing his postdoc research working on that problem. I won't say much about his solution which involves morphometrics/ landmark analysis but keep you informed about results when they are published.