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Facies (Lonit te hanc topored ) 95
stop (3)
Thin Section Sample Descriptions
Sample Number
1.
Formation Wills Creek
Age of Fm. Silurian
Location (where sample collected) and Date Highland County, VA
Sep 22, 2018
Name of Collector Abdulaziz Adawi
Grain Size/Range
Grains
mean size 0.1 mm
range of sizes 0.01 mm 0.15 mm
estimated percentage of rock_22
Matrix estimated percentage of rock 97%
Grain size distribution (is there a pattern, bedding, lamination, concentrations)
.
Drawing of thin section
(low power)
Minerals and estimated percentages
1 Calcite Mud 97%
2 Qtz 2%
3 others 17
Cements Calcite
Sorting
Roundness: well rounded → rounded subrounded) subangular → angular
euhedral → subhedral → andhedral
Sphericity_high-low sphericity (atz)
Grain-to-grain contacts
Fossils and estimated percentages
It has sort of crenkly limination with a lot of littel pore spaces that probbly
from gas bubble. however, It almost called birdeges structure.
Sedimentary structures Lamination
- we can see all this flame structure at the botton that lookes like white
bumps, dots, and speckles all the way through it and then there is dark layer, then there are light gray.enlight brown
Color Light Olive Brown
then another darle lyere efe.
Rock Type (Dunham classification) mudstone
modstand
Dunham limestone classification scheme
Algal laminated Stamata litic
depositional texture recognizable
depositional
texture
not
recognizable
original components not bound together during deposition
original components
bound together
during deposition
contains mud
(particles of clay and fine silt size)
mud-supported
grain-supported
lacks mud
and is
grain-supported
10% grains
crystalline
carbonate
boundstone
mudstone
grainstone
wackestone
packstone
facies
very
Other Remarks
you
light Olive Brown laminated mud stare with 27 Grains, range sized from 0.02mm - 0.15mm,
estimated Percentage of cements is about 97%. Contiane 97% of Colcite as fire brownish mud and white cements.
here is also 2% of subrounded mid spericity atz.
clotted layers tareas with cleme structures Birdsere or stromatactis strature
Alternating layers of fine mjerite with
Facies 2-
(peloidollostrocod/colitic grainston
)
Thin Section Sample Descriptions
Sample Number 2 Formation _Tonoloway
Age of Fm. Silurian
Location (where sample collected) and Date Highland Conty, VA Sep 22, 2012 (stop)
Name of Collector Abdulaziz Adami
Grain Size/Range
fine grain store
Coarse grainstong
wack store ostracada pack shou
Grains
mean size (-Q1 -0.03 mm 10.03 -0.1
0.35 mm
range of sizes 80%-85%
estimated percentage of rock
estimated percentage of rock
Grain size distribution (is there a pattern, bedding, lamination, concentrations)
Matrix
Minerals and estimated percentages
y Calite 98%
2 Qrtz 22
Drawing of thin section
(low power)
3
Cements Calcite 15-20% ochrack
Sorting Very will sorted land orignized)
Roundness: well rounded → rounded → subrounded → subangular → angular
euhedral → subhedral andhedral
Coarse
Sphericity
Grain-to-grain contacts
& fine
Fossils and estimated percentages Deloids - with some coatings
Ostracales, Mollusks) Echinoderm fragments forams
Sedimentary structures graded bed, Lamintions - fine grainstone -
Color Light Olive Gray
Ostracode packstone -
Rock Type (Dunham classification) grain stene
coarser grainstorse?
sharplase ?
Dunham limestone classification scheme
depositional texture recognizable
depositional
texture
not
recognizable
original components not bound together during deposition
original components
bound together
during deposition
contains mud
(particles of clay and fine silt size)
mud-supported
grain-supported
lacks mud
and is
grain-supported
10% grains
crystalline
carbonate
mudstone
wackestone
packstone
boundstone
151
Other Remarks
grainstone
Facies s
Light Oline Gray beded grain stone, that have 3 faces, fine grainstre part, coarse grainstones
and wack stone ostrocode Packstone parts. there estimated percentages of 98% Cakite with 2% a Qrte.
ther rock shores very will sorted and well rounded Peloids with some coatings, also the rock contane fossils
Facies 3 ( Laminated to graded
Peloidol brachiopod ostraced packstone
3
Thin Section Sample Descriptions
Sample Number_3 Formation Tonoloway Age of Fm. Silurian
Location (where sample collected) and Date Highland County, VA
Sep 22, 2019 Istop #3)
Name of Collector Abdulaziz Adawl
Grain Size/Range
mean size_001 may
Course fossil brachiopods
range of sizes 0.01mm . CiTrim
to med gogined peleda
estimated percentage of rock 7FZ
estimated percentage of rock_25%
Grain size distribution (is there a pattern, bedding, lamination, concentrations)
Grains
Matrix
Drawing of thin section
Minerals and estimated percentages
1 Calcite 98%
2 Qt.
(low power)
3
Cements _Calcite 163
Sorting_mid
Roundness: well rounded rounded → subrounded → subangular — angular
euhedral → subhedral → andhedral
Sphericity high
Grain-to-grain contacts
Fossils and estimated percentages
There are mine
Sedimentary structures Lomination / Grading
Obstra cales, brachiopods peloida
Color Brilliant Green
ated, Mackestorul
Rock Type (Dunham classification) bowerstone Wit Sonepac,
como
Kaci
TEST
Dunham limestone classification scheme
depositional texture recognizable
depositional
texture
not
recognizable
original components not bound together during deposition
original components
bound together
during deposition
contains mud
(particles of clay and fine silt size)
mud-supported
grain-supported
lacks mud
and is
grain-supported
10% grains
crystalline
carbonate
mudstone
wackestone
packstone
grainstone
boundstone
Other Remarks
نهر
and
Light Olive gray peloidal brachiopod wackostove, packsteine
Alternating Layers w poloids Brachst ostrecoday that very
Assignment
Write a 10 page report that is about your formation from the field trip. Seek out and
include information about how sedimentation was greatly influenced by tectonic activity
or sea level change. This report will be a survey of the literature and a focus on your
formation and the influences of tectonics and sea level change on sedimentation and
stratigraphy. You will include the descriptions and documentation on the samples you
collected. You will describe your samples as different facies that represent different
subenvironments or parts of facies successions in your formation and explain how they fit
in. Your main thesis will be that your formation is primarily a (you name the
environment) environment with several facies and is the result of the tectonic and or sea
level history that you describe.
Library research
Peer reviewed primary sources The following and more, but check with Dave.
Journal of Sedimentary Research (Journal of Sedimentary Petrology),
Sedimentology, Palaios, Journal of Paleontology, Palaeontology, Lethaia, Palaeo
Palaeo Palaeo, American Association of Petroleum Geologists Bulletin,
Geological Society of America Bulletin, Geology, USGS Bulletin, USGS
Professional Paper, Journal of Geology, Nature, Science, Biogeology, Memoirs of
the Geological Society of America, And Much Much More
GeoRef - Your main source for information on geological articles. A comprehensive
database of everything ever published in geology. Available through OhioLink.
Replaces Bibliographic Index of Geology – monthly lists of publications
Internet research – You may use the internet as a method to track down data, but peer
reviewed publications including published journals, field guides, memoirs of societies,
books, and other official publications of geological societies, schools, and government
surveys. Websites ARE NOT valid sources. Imagine picking up a loose scrap of paper
hand-written on a table at Izzy's and using it to defend the thesis.
References should use the format in Geology, GSA Bulletin, USGS Bulletin, or Journal
of Paleontology
Author, Date, Title: Journal, volume, number, pages
Citations within text (Author, date) or ...as noted by Author (date)
General Outline
Introduction
Just this part
More detailed outline
Introduction
First part of Intro: General Geological Background
Formation and age
Basin Setting (Include map)
General stratigraphy (Include stratigraphic column)
Geologic History of Basin with special focus on time period of interest, include
1 Paleogeographic map.
Second part of Intro: Previous Work on Formation, Environments and Facies
Formation specifics, rock types, thickness trends, extent, etc...
Tectonic history
Formation description from literature
Sediments and facies
Paleontology
Stratigraphic trends and correlations
Environnmental interpretation and Facies associations
Diagenesis if applicable
Methods 72 to 1 page – went to field, photographed outcrop, determined different
lithologies, made thin sections (how), described using standard petrographic
techniques, used Dunham or Pettijohn for classification etc...
Data: Description of three samples – put data sheets in back, not included in 10 pages.
Location, Rock Types, give range of rock types
Describe samples collected
Description of outcrop
Description of thin sections
Interpretations
Three facies from thin sections
How they fit into previously published Environment of Deposition
In what way did tectonics influence sedimentation
Paleoclimatic and paleogeographic implications
Other Discussion, diagenesis, fossils...
Conclusions
What are the main take home points
What big problem did you solve and give the implications
Why should we care
References In appropriate format that match citations in text