NDLI: Dinosaur track record on a shallow carbonate-dominated ramp (Loulle section, Late Jurassic, French Jura)

Content Provider	Springer Nature Link
Author	Cariou, E. Olivier, N. Pittet, B. Mazin, J. M. Hantzpergue, P.
Copyright Year	2013
Abstract	In 2006, sauropod and theropod trackways were discovered at the locality of Loulle in the French Jura Mountains. During the Late Oxfordian (sensu gallico), Loulle was located at the southeastern margin of the carbonate-dominated French Jura platform. The upper part of the section contains a 94-cm-thick dinosaur track-bearing interval. Dinosaur tracks were recorded in a tidal-flat setting punctuated by frequent flooding and emersion phases leading to desiccation, microbial mat development, and new sediment inputs. Four types of tracks were identified relative to their morphologies and the rheology of the tracked sediment. Tracks were recorded on sediment with different degrees of water saturation, covered with a thick, cohesive, and elastic microbial mat. This mat cover prevented tracks from erosion agents but also prevented the record of trackmaker anatomical details. Early lithification, probably driven by enhanced dolomitization, allowed the rapid fossilization of the tracks, protecting them from reworking during the subsequent dinosaur tracking phases. Sequential analysis reveals that the record of dinosaur tracks was made possible by a gain of accommodation at the scale of elementary (infra-Milankovitch) and small-scale (100 kyr) sequences. The loss of accommodation observed at the scale of medium-scale (400 kyr) and very small scale (20 kyr) sequences enhanced the ramp progradation at the Bimammatum-Planula boundary, allowing dinosaurs to walk on the Loulle tidal-flat, along a narrow ENE/WSW isthmus.
Starting Page	229
Ending Page	253
Page Count	25
File Format	PDF
ISSN	01729179
Journal	Facies
Volume Number	60
Issue Number	1
e-ISSN	16124820
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-04-04
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dinosaur tracks Carbonate-dominated ramp Sea-level changes Depositional sequences Late Jurassic French Jura Sedimentology Biogeosciences Geochemistry Paleontology Ecology
Content Type	Text
Resource Type	Article
Subject	Geology Stratigraphy Paleontology

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