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This book documents and interprets the onshore Cenozoic temperate
carbonate depositional system along the southern margin of
Australia. These strata, deposited in four separate basins,
together with the extensive modern marine system offshore, comprise
the largest such cool-water carbonate system on the globe. The
approach is classic and comparative but the information is a
synthesis of recent research and new information. A brief section
of introduction outlines the setting, modern comparative
sedimentology offshore, and structure of the Cenozoic onshore. The
core of the book is a detailed analysis and illustration of the
four Eocene to Pleistocene successions. Deposits range from
temperate carbonates, to biosiliceous spiculites, to marginal
marine siliciclastics. Each unit is interpreted, as much as
possible, based on our understanding of the modern offshore
depositional system. A subsequent part concentrates on diagenesis
both before and after the late Miocene uplift. It turns out that
alteration in the two packages is entirely different. The preceding
attributes of each succession are then interpreted on the basis of
controlling factors such as tectonics, oceanography, climate, and
glaciation of nearby Antarctica. This research has revealed new
implications for the interpretation of specific attributes of
cool-water carbonate sedimentology that could only be discovered
from the rock record. Insights concerning cyclicity, reef mounds,
biosiliceous deposition, and trophic resources are detailed in the
next section. The concluding part focuses on global comparisons,
especially the Mediterranean and New Zealand.
Landscapes of the past have always held an inherent fascination for
ge ologists because, like terrestrial sediments, they formed in our
environment, not offshore on the sea floor and not deep in the
subsurface. So, a walk across an ancient karst surface is truly a
step back in time on a surface formed open to the air, long before
humans populated the globe. Ancient karst, with its associated
subterranean features, is also of great scientific interest because
it not only records past exposure of parts of the earth's crust,
but preserves information about ancient climate and the movement of
waters in paleoaquifers. Because some paleokarst terranes are
locally hosts for hydrocarbons and base metals in amounts large
enough to be economic, buried and exhumed paleokarst is also of
inordinate practical importance. This volume had its origins in a
symposium entitled "Paleokarst Systems and
Unconformities-Characteristics and Significance," which was orga
nized and convened by us at the 1985 midyear meeting of the Society
of Economic Paleontologists and Mineralogists on the campus of the
Colorado School of Mines in Golden, Colorado. The symposium had its
roots in our studies over the last decade, both separately and
jointly, of a number of major and minor unconformities and of the
diverse, and often spectacular paleokarst features associated with
these unconformities."
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