The Middle Cretaceous Urgonian Platform of Southeastern France
Name: Urgonian carbonate platform, Subalpine Chains
Authors: Dave Hunt and Maurice E. Tucker
Location: From 44° 80' to 46° 20' north latitude and 5° to 6° east longitude, southeastern France
Geologic time interval: Early Cretaceous, latest Hauterivian-Aptian
Tectonic-sedimentary setting: Opening ocean, passive margin
Basin type: Passive margin
Paleoclimate: Semi-arid with humid intervals
Platform type: Carbonate shelf, at times rimmed shelf
Platform geometry: 100–300 m thick; 150 km wide and 300 km long
Facies and fossils: Shelf margin bioclastic-oolitic grainstone, on-shelf rudist wackestone–packstone, foreslope grainstone–wackestone, basinal wackestone-mudstone-hemipelagite. Rudists, other molluscs, foraminifera, corals, bryozoans, calcareous algae.
Systems tracts: Lacustrine–tidal flat, open to restricted shelf–lagoonal, shelf margin, foreslope, basin
Stacking patterns: mainly aggradational and progradational sequences and shoaling cycles
Figures & Tables
With the large amount of information from Cretaceous basins available for comparative studies in the early 1990s, it seemed appropriate and timely to make available these regional studies on carbonate platforms, aiming at a convenient and objective presentation in a standard format. This volume represents the result of that effort. It brings together 32 well-documented data sets on carbonate platforms from 17 countries, which represent a significant part of the spectrum of Cretaceous carbonate platforms in different geologic provinces and tectonic settings. Two introductory articles summarize some of the main aspects of the Cretaceous period, carbonate platforms, and economic resources, and review each case study. The objectives of this book are to document styles of formation, growth, and development of Cretaceous carbonate platforms and to compare platform geometries, dimensions, and styles of similar platforms but different tectonic-sedimentary settings.