PROGRESS REPORT
“Stratigraphic Architecture of Deep-Ramp Carbonates: Implications for Deposition
of Volcanic Ashes, Salona and Coburn Formations, Central Pennsylvania”
by John Lerner
SCOPE AND PURPOSE
The Late Middle Ordovician-age Salona and Coburn formations of central Pennsylvania
show cyclic patterns on a scale of tens of meters. Little research has been done on sequence
stratigraphy of deep-water mixed carbonate/siliciclastic systems, and a depositional model
for this environment is necessary to understand the timing and processes of deposition. The
stratigraphic position of the bentonites at the base of the larger cycles is significant because
it indicates that they accumulated during a time of non-deposition in a deep water
environment.
PROGRESS
To date, I have described five lithofacies present in the Salona and Coburn formations. Two
lithofacies are interpreted as storm deposits and make up the limestone component of the
thinly-bedded couplets. Some trends were observed in the raw data; however, because of the
“noisy” nature of the data, a plot of the five-point moving average of bed thickness was
created to define the cycles better.
ADDITIONAL WORK
Two key tasks are to be completed in the coming weeks. With the results of these tests and
the field observations, I will create a model for deposition of a deep-ramp mixed
carbonate/siliciclastic system in a foreland basin environment. The model will include
depositional processes, stratigraphic architecture, and tectonic setting.
PROGRESS REPORT
“Stratigraphic Architecture of Deep-Ramp Carbonates: Implications for Deposition
of Volcanic Ashes, Salona and Coburn Formations, Central Pennsylvania”
by John Lerner
SCOPE AND PURPOSE
The Late Middle Ordovician-age Salona and Coburn formations of central Pennsylvania
show cyclic patterns on a scale of tens of meters. Little research has been done on sequence
stratigraphy of deep-water mixed carbonate/siliciclastic systems, and a depositional model
for this environment is necessary to understand the timing and processes of deposition. The
stratigraphic position of the bentonites at the base of the larger cycles is significant because
it indicates that they accumulated during a time of non-deposition in a deep water
environment.
PROGRESS
To date, I have described five lithofacies present in the Salona and Coburn formations. Two
lithofacies are interpreted as storm deposits and make up the limestone component of the
thinly-bedded couplets. Some trends were observed in the raw data; however, because of the
“noisy” nature of the data, a plot of the five-point moving average of bed thickness was
created to define the cycles better.
ADDITIONAL WORK
Two key tasks are to be completed in the coming weeks. With the results of these tests and
the field observations, I will create a model for deposition of a deep-ramp mixed
carbonate/siliciclastic system in a foreland basin environment. The model will include
depositional processes, stratigraphic architecture, and tectonic setting.
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