Foto: Brahim Ben

The newest scientific opinion (10/17):

"I'm Prof. El Hafid Bouougri from the Deparetment of Geology, Cadi Ayyad University, Marrakech, Morocco ... I took also some time to look on your webpage "palaeontologie-troppenz.de" and surprisingly I found a Photo and a discussion about a structure from the ordovician of Morocco. I can confirm that this structure is "Kinneyia-type wrinkles", I published two papers on these structures together with colleagues from Germany, papers are available on my researchegate page."
 
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Auf Facebook (Uwe M. Troppenz) ist im September 2017 eine rege internationale Diskussion entbrannt über ein Problematikum aus dem Ordovizium Marokkos. Auch auf den Seiten "The fossil forum" und "Ichnology" wurde diskutiert , mehrere Einzelpersonen übernahmen die Bilder auf ihre eigenen Seiten.

In September 2017 there was a big discussion about a problematic discovery in the Ordovician of Morokko. The pages "The fossil forum" and "Ichnology" adopted the theme, many persons took the pictures on their own pages.

WAS IST DAS?
WHAT'S THAT?

Facebook-Freund Brahim Ben hat mir dieses Bild geschickt: eine Platte mit schönen Wellenrippeln aus dem Ordovizium von Tazarine/Marokko und drei kleinen Kugeln darauf. Hat jemand eine Idee, was das sein könnte?

Facebook-friend Brahim Ben sent me this picture: a slide with three little balls on pretty wave ripples (Ordovician from Tazarine/Morocco). Is there someone who has an idea what it could be?

Martin Sauter
Martin Sauter Anorganisch?
Uwe M. Troppenz
Uwe M. Troppenz Anorganisch oder biogener Herkunft - beides ist möglich. Die Gleichmäßigkeit fällt auf.
Uwe M. Troppenz
Uwe M. Troppenz Here you see the whole plate with parts of trilobites beside (right side).
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Miquel Ramon Martí
Miquel Ramon Martí Very interesting plate
Uwe M. Troppenz

Uwe M. Troppenz MORE DISCUSSIONS CONCERNING THESE PROBLEMATIC "WAVES" YOU CAN READ ON "THE FOSSIL FORUM" AND "ICHNOLOGY"!!!

THERE ARE MANY DIFFERENT RIPPLEMARKS IN MANY SITUATIONS AND ENVIRONMENTAL CONDITIONS IN THE DEEP TIMES. BUT OTHER INTERPRETATIONS ARE CONCLUSIVE, TOO...

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Jean Barbeau

h\t Uwe M. Troppenz. Je partage ce magnifique exemple de ce qu'un biofilm peut imprimer comme structure sur une surface soumise aux mouvements de l'eau. Ces MISS (Microbially Induced Sedimentary Structures) se retrouvent dans les archives des temps très anciens (jusqu'à 3,7 milliards d'années). Sur cette photo, nous remontons à l'Ordovicien (485,4 ± 1,9 à 443,4 ± 1,5 million d'années). Les structures arrondies pourraient avoir été causées par le dégagement de gaz par les organismes.

Les MISS deviendront de plus en plus rares avec l'avènement de la révolution agronomique (au Cambrien) qui a vu l'émergence d'organismes complexes capables de se nourrir aux dépens des films microbiens et furent à l'origine d'un brassage important des sédiments au niveau vertical. Cette révolution agronomique était bien implantée à l'Ordovicien.

Uwe M. Troppenz MERCI BIEN POUR VOTRE INTERPRÉTATION, Jean Barbeau! C'EST TRÈS INTERESSANT! LA PHOTO MONTRE LES DIMENSIONS.
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Uwe M. Troppenz
Uwe M. Troppenz Après une nuit et un jour je suis d'accord avec votre interpretation, Jean Barbeau. C'est la solution pour ce problème.
Jean Barbeau

Jean Barbeau Je suis loin d'être un expert, mais l'interprétation me semble possible.

Pierre Dicenzo
Pierre Dicenzo Ne devrait-on pas parler de stabiliser ou fixer, au lieu d’imprimer!
Jean Barbeau
Jean Barbeau C'est exact Pierre.
Jean Barbeau J'ai corrigé

ICHNOLOGY
 
Bill Blakers Feeding trails ?
Matt Stimson
Matt Stimson Microbial wrinkles. What's the age?
John A. Spina Jr.
John A. Spina Jr. Microbial mat surfaces, a good example of MISS.
Patrick R Gonsoulin-Getty
Patrick R Gonsoulin-Getty Looks like ripples to me; they could be affected by microbial processes.
Chikh Younes Mahboubi

Chikh Younes Mahboubi DESCRIPTION: A meandering trace consisting of a central furrow flanked on both sides by regular closely spaced oval or circular lobes, closely spaced, commonly finely striated. Meanders may be densely space and vary in width, shape, and size.

BEHAVIOR(S): Feeding or grazing trace of a deposit-feeding animal.

ENVIRONMENTAL SETTINGS: Marine, deep marine to lagoonal to deltaic environments. Commonly found on the top surface of thin turbidites in near abyssal plain areas (slope/abyssal) in sand and mud-based media. Reported in lacustrine turbidites (Hu et al., 1998).

POSSIBLE TRACEMAKERS: Annelid worms, gastropods, or arthropods.

GEOLOGIC RANGE: Precambrian-recent.

ADDITIONAL REFERENCES: (Seilacher, 1983, 1986)(Devera, 1989)(Rindsberg, 1994)(Uchman, 1995)(Orr, 1995)(Mangano et al., 2000).

REMARKS: Possible preservational variant with Neonereites Seilacher, 1960 and Scalarituba Weller, 1899 with Neonereites and Scalarituba as junior synonyms.

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Andrew Rindsberg
Andrew RindsbergGruppenadministrator The anastomosis and blind ends suggest that this structure is more akin to ripplemarks than to feeding burrows. However, as others have already pointed out, some ripplemarks are partially stabilized by biofilms or biomats, and these are particularly common in Cambrian strata. Any interpretation must address the strange medial structures at the crest of these ridges, and also the parallel structures seen on their flanks.
Lothar Herbert Vallon
Lothar Herbert Vallon Let's go with the microbial mat/ripplemark hypothesis (although I do not really want to take part in this discussion as I have a very strong personal antipathy against the original publisher of this picture and he has against me...). Let's think further that it was created in an area that can run dry from time to time... How would these mats crack during desiccation? On the ripple crests? The MISS idea woul probably also find explanation for the three bulbs which is the main thing he will be trying to find an explanation for...
Don Chesnut
Don Chesnut How about multi-crested ripples?
Paul Goodrich
Paul Goodrich Low energy, oscillating tidal flat waters with density and particle variations, possible convergence with muddy estuarine input, producing divergent from the mean and complex - but not unusual bifurcation. Ripples.

Jean Barbeau
Jean Barbeau Wrinkles from microbial mat... (Matt Stimson, and John A. Spina Jr.)
Norbert Lutoslawski
Norbert Lutoslawski Yeah, the algal mat info looks good to me. I want to look into it more when I have the time however. I love stromatolites and such so I am very happy to learn about this as well!! Thank you so much!!
John A. Spina Jr.
John A. Spina Jr. MISS from Venango Fm. NE Pennsylvania.
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