Tomstown Dolomite

Stratigraphic range: Cambrian

USGS photo 1 mile east of Bakerton, West Virginia

Type| Sedimentary
Underlies| Rome Group and Waynesboro Formation
Overlies| Antietam Formation and Chilhowee Group
Thickness| 200 - 1000 feet
Lithology
Primary| dolomite
Other| Chert, limestone, shale
Location
Region| Appalachia, Mid-Atlantic United States, and Southeastern United States
Country| United States
Extent| Maryland, Pennsylvania, Virginia,[1] West Virginia

The Tomstown Dolomite or Tomstown Formation is a geologic formation in Maryland, Pennsylvania, Virginia and West Virginia.[2][3][4] It preserves fossils dating to the Cambrian Period.

In Maryland it is described as "Interbedded light gray to yellowish-gray, thin- to thick-bedded dolomite and limestone; some shale layers; gradational contact with Antietam; thickness 200 to 1,000 feet."[2]

## See also[edit]

* Paleontology portal

* List of fossiliferous stratigraphic units in Maryland
* List of fossiliferous stratigraphic units in Pennsylvania
* List of fossiliferous stratigraphic units in Virginia
* List of fossiliferous stratigraphic units in West Virginia

## References[edit]

1. ^ Paleozoic Sedimentary Successions of the Virginia Valley & Ridge and Plateau
2. ^ a b Tomstown Dolomite in Maryland
3. ^ Tomstown Dolomite in Virginia
4. ^ Tomstown Dolomite in West Virginia

* Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.

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Chronostratigraphy of Virginia

Ph|

| Pz|

| C|

| ⁋|

| Moscovian|

* Betsie Shale
* Grundy Formation
* Hyden Formation
* Kendrick Shale
* Pikeville Formation

|

Bashkirian|

* Bee Rock Formation
* Hensley Shale
* Sewannee Formation
* Warren Point Formation

* Lee Formation

| Serpukhovian|

* Bluefield Formation
* Bluestone Formation
* Cove Creek Formation
* Fido Sandstone
* Hinton Formation
* Princeton Formation
* Stony Gap Formation

|

Viséan|

* Denmar Formation
* Fort Payne Formation
* Gasper Formation
* Hillsdale Formation
* Little Valley Formation
* Maccrady Formation
* Taggard Formation

Tournaisian|

* Maccrady Formation
* Price Formation
* Sunbury Shale

* Pocono Formation

| Upper|

| Famennian|

* Brallier Formation
* Foreknobs Formation
* Cloyd Conglomerate
* Hampshire Formation
* Millboro Shale
* Pound Formation

|

Frasnian|

* Brallier Formation
* Foreknobs Formation
* Millboro Shale
* Pound Formation

Middle|

| Givetian|

* Mahantango Formation
* Millboro Shale

|

Eifelian|

* Huntersville Chert
* Tioga Bentonites
* Marcellus Shale
* Millboro Shale

Lower|

| Emsian|

* Huntersville Chert
* Needmore Shale

|

Pragian|

* Oriskany Sandstone
* Ridgeley Sandstone
* Wildcat Valley Sandstone

Lochkovian|

* Helderberg Group
* Keyser Limestone
* Oriskany Sandstone
* Ridgeley Sandstone
* Wildcat Valley Sandstone

| Pridoli|

* Hancock Dolomite
* Keyser Limestone
* Tonoloway Limestone

|

Ludlow|

| Ludfordian|

* Bloomsburg Formation
* Keefer Sandstone
* McKenzie Formation

|

Gorstian|

* Bloomsburg Formation
* Keefer Sandstone
* Lockport Dolomite

Wenlock|

| Homerian|

* Keefer Sandstone
* Rochester Shale

|

Sheinwoodian|

* Keefer Sandstone

Llandovery|

| Telychian|

* Massanutten Sandstone
* Rose Hill Formation
* Tuscarora Sandstone

|

Aeronian|

* Massanutten Sandstone
* Tuscarora Sandstone

| Upper|

* Bays Formation
* Benbolt Formation
* Blackford Formation
* Bowen Formation
* Chatham Hill Formation
* Edinburg Formation
* Effna Limestone
* Eggleston Formation
* Elway Limestone
* Fetzer Limestone
* Five Oaks Limestone
* Gratton Formation
* Juniata Formation
* Knobs Formation
* Lenoir Formation
* Lincolnshire Formation
* Martinsburg Formation
* Moccasin Formation
* Mosheim Limestone
* New Market Limestone
* Oranda Formation
* Oswego Formation
* Paperville Shale
* Reedsville Formation
* Rich Valley Formation
* Rockdell Formation
* Trenton Limestone
* Ward Cove Limestone
* Wardell Formation
* Wassum Formation
* Witten Formation

|

Middle|

* Pinesburg Station Dolomite

Lower|

* Chepultepec Dolomite
* Kingsport Formation
* Longview Limestone
* Mascot Dolomite
* Rockdale Run Formation
* Stonehenge Limestone

* Antietam Formation
* Conasauga Formation
* Conococheague Limestone
* Copper Ridge Dolomite
* Elbrook Formation
* Erwin Formation
* Hampton Formation
* Harpers Formation
* Rome Formation
* Shady Dolomite
* Tomstown Dolomite
* Unicoi Formation
* Waynesboro Formation
* Weverton Formation

pЄ|

| ♇|

| Z|

* Swift Run Formation

|

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Chronostratigraphy of West Virginia

Ph|

| Cz|

| Pe|

| Eocene|

Igneous intrusives

|

Mz|

| J|

Igneous intrusives

|

Pz|

| P|

| Cisuralian|

| Asselian|

* Dunkard Group

|

| ⁋|

| Gzhelian|

* Monongahela Formation

|

Kasimovian|

* Conemaugh Group

Moscovian|

* Allegheny Formation

Bashkirian|

* Pottsville Group
* Kanawha Formation
* New River Formation
* Pocahontas Formation

| Serpukhovian|

* Bluestone Formation
* Princeton Sandstone
* Hinton Formation
* Bluefield Formation

|

Viséan|

* Greenbrier Group

Tournaisian|

* Price Formation
* Cuyahoga Formation
* Maccrady Formation
* Sunbury Shale
* Berea Sandstone

| Upper|

| Famennian|

* Price Formation
* Berea Sandstone
* Bedford Shale
* Ohio Shale
* Brallier Formation

|

Frasnian|

* Brallier Formation
* Java Formation
* West Falls Formation
* Rhinestreet
* Sonyea Formation
* Harrell Shale
* Genesee Formation

Middle|

| Givetian|

* Tully Limestone
* Hamilton Group

|

Eifelian|

* Hamilton Group
* Marcellus Shale
* Onondaga Limestone
* Needmore Shale
* Huntersville Chert

Lower|

| Emsian|

* Needmore Shale
* Huntersville Chert

|

Pragian|

* Oriskany Sandstone

Lochkovian|

* Helderberg Group

| Pridoli|

* Bertie Formation
* Bass Islands Formation
* Keyser Formation

|

Ludlow|

| Ludfordian|

* Salina Group
* Tonoloway Formation

|

Gorstian|

* Salina Group

Wenlock|

| Homerian|

* Salina Group
* Wills Creek Formation
* Williamsport Formation
* McKenzie Formation

|

Sheinwoodian|

* Lockport Dolomite
* McKenzie Formation

Llandovery|

| Telychian|

* Lockport Dolomite
* McKenzie Formation
* Keefer Formation
* Rose Hill Formation
* Rochester Shale

|

Aeronian|

* Tuscarora Sandstone
* Clinton Sandstone

| Upper|

| Hirnantian|

* Cincinnati Group
* Juniata Formation

|

Katian|

* Cincinnati Group
* Juniata Formation
* Reedsville Formation
* Utica Shale

Sandbian|

* Lexington Limestone
* Trenton Limestone

* Dolly Ridge Formation
* Martinsburg Formation
* Nealmont Limestone
* Oswego Formation

Middle|

| Darriwilian|

* Trenton Limestone
* Black River Group

|

Dapingian|

* St. Paul Group

* St. Peter Sandstone

Lower|

| Tremadocian|

* Wells Creek Formation

Knox Group

* Beekmantown Dolomite
* Rose Run Sandstone

|

| Furongian|

| Stage 10|

Knox Group

* Copper Ridge Dolomite

|

Chilhowee Group
Antietam Formation
Harpers Formation
Weverton Formation
Loudoun Formation

* Conasauga Group
* Conococheague Formation
* Elbrook Formation
* Rome Group
* Tomstown Dolomite
* Waynesboro Formation

pЄ|

| ♇|

| Z|

| Ediacaran|

* Catoctin Formation

|

* Swift Run Formation
* Grenville Complex

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