Great Scar Limestone Group

{{Infobox rockunit

| name = Great Scar Limestone Group

| image =

| caption =

| type = Group

| age = Arundian-Brigantian

| period = Visean

| prilithology = Limestone

| otherlithology = Mudstone, siltstone, sandstone

| namedfor =

| namedby =

| region = England

| country = United Kingdom

| coordinates =

| unitof = Carboniferous Limestone Supergroup

| subunits = See text

| underlies = Yoredale Group

| overlies = Ravenstonedale Group

| thickness = Up to {{convert|800|m|ft|abbr=on}}

| extent = Pennines to Isle of Man

| area =

| map =

| map_caption =

}}

The Great Scar Limestone Group is a lithostratigraphical term referring to a succession of generally fossiliferous rock strata which occur in the Pennines in northern England and in the Isle of Man within the Tournaisian and Visean stages of the Carboniferous Period.

It is contained within the Carboniferous Limestone Supergroup.{{cite web | url=http://www.bgs.ac.uk/lexicon/lexicon.cfm?pub=GSCL | title=Great Scar Limestone Group | publisher=British Geological Survey | work=The BGS Lexicon of Named Rock Units | access-date=27 July 2014}}

Basinal successions

= Stainmore Trough =

The sequence in the Stainmore Trough is thus (youngest at top):

Ashfell Sandstone (Arundian age)
Breakyneck Scar Limestone (Arundian age)
Red Hill Formation
Brownber Formation (Chadian age)
Scandal Beck Limestone (Chadian age)
Coldbeck Limestone (Chadian age)

On the Alston Block corresponding to the North Pennines, the sequence contains the Melmerby Scar Limestone Formation.

= Orton area =

In the Orton area, the sequence is:

= Kendal, Skelsmergh and Deepslack outliers =

In south Cumbria, the sequence is:{{cite book |title=1:50,000 Geology Series England and Wales Sheet 28 Whitehaven Bedrock |date=2004 |publisher=British Geological Survey |isbn=0751831603}}

Urswick Limestone
Park Limestone
Dalton Formation (time-equivalent of Breakyneck Scar Limestone in Stainmore Trough) (Arundian age)

= Isle of Man =

On the Isle of Man, the following sequence is identified in the Castletown area:{{cite book |last1=Stone |first1=P |last2=Millward |first2=D |last3=Young |first3=B |last4=Merritt |first4=J W |last5=Clarke |first5=S M |last6=McCormac |first6=M |last7=Lawrence |first7=D J D |title=British Regional Geology: Northern England |date=2010 |publisher=British Geological Survey, NERC |isbn=9780852726525 |pages=124–126}}{{cite book |title=Isle of Man solid and drift geology 1:50,000 scale |date=2001 |publisher=British Geological Survey, NERC |isbn=0751833266}}

Knockcrushen Formation (wackestones, packstones and mudstones; of Holkerian age)
Derbyhaven Formation (packstones and mudstones with some mudstones and siltstones; of Arundian age)
Skillicore Member
Sandwick Member
Turkeyland Member