Revision History for Data Series 774

U.S. Geological Survey

National Assessment of Geologic Carbon Dioxide Storage Resources—Data
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First posted online June 26, 2013

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Revised and reposted on September 24, 2013, as Data Series 774, Version 1.1

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After publication, discrepancies were noticed in the area input for 5 of this report’s 192 
quantitatively assessed storage assessment units (SAUs). In the original version of this 
report, for the U.S. Gulf Coast, the areas for the Norphlet Formation and Norphlet Formation 
Deep SAUs had been transposed with areas for the Smackover Formation and Smackover Formation 
Deep SAUs. For the Michigan Basin, there was a transcription mistake in the Dundee Formation
SAU that enlarged the originally reported area by 16.5 percent. Correction of these 
discrepancies, when propagated to the basin, regional, and national totals, resulted in minor 
changes. The revised area values affected the total technically accessible storage resource 
(TASR) values for the mean for the Coastal Plains Region (2,000,000 Mt to 1,900,000 Mt) and 
the P5 for the Nation (2,400,000 Mt to 2,300,000 Mt). The actual changes were only thousands 
of megatons; however, rounding to two significant figures created the appearance that differences 
were hundreds of thousands of megatons. The correct results for the five affected SAUs of the 
U.S. Gulf Coast and the Michigan Basin are included in version 1.1 of this report. In 
appendix 1, changes have been made to the area inputs for five SAUs and to allocations for 
nine SAUs. In appendix 2, empirical cumulative distribution function (CDF) plots have been 
redrawn for the five SAUs in which resource numbers changed. Table 1, a data table with all 
inputs to and outputs from the assessment, reflects the changes made in the two appendixes. 

Changes in appendix 1 for areas of 5 storage assessment units

p. 184: Dundee Formation SAU, Michigan Basin, Eastern Mid-Continent Region
p. 272: Norphlet Formation SAU, U.S. Gulf Coast, Coastal Plains Region
p. 274: Norphlet Formation Deep SAU, U.S. Gulf Coast, Coastal Plains Region
p. 276: Smackover Formation SAU, U.S. Gulf Coast, Coastal Plains Region 
p. 278: Smackover Formation Deep SAU, U.S. Gulf Coast, Coastal Plains Region

Changes in appendix 1 for allocations of area to States or to general land-ownership categories for 9 storage assessment units

p. 25: Middle Schrader Bluff Formation SAU, Alaska North Slope Basin, Alaska Region
p. 57: Hunton Group SAU, Arkoma Basin, Western Mid-Continent Region
p. 63: Upper Cretaceous Composite SAU, Atlantic Coastal Plain, Coastal Plains Region
p. 253: Pre-Punta Gorda SAU, South Florida Basin, Coastal Plains Region
p. 273: Norphlet Formation SAU, U.S. Gulf Coast, Coastal Plains Region
p. 275: Norphlet Formation Deep SAU, U.S. Gulf Coast, Coastal Plains Region
p. 277: Smackover Formation SAU, U.S. Gulf Coast, Coastal Plains Region
p. 279: Smackover Formation Deep SAU, U.S. Gulf Coast, Coastal Plains Region
p. 343: Newcastle Formation SAU, Williston Basin, Rocky Mountains and Northern Great Plains Region

Changes in appendix 2 to redraw cumulative distribution function (CDF) plots for 5 storage assessment units 

Michigan Basin, C50630104 (Dundee Formation SAU)
U.S. Gulf Coast, C50490101 (Norphlet Formation SAU)
U.S. Gulf Coast, C50490102 (Norphlet Formation Deep SAU)
U.S. Gulf Coast, C50490103 (Smackover Formation SAU)
U.S. Gulf Coast, C50490104 (Smackover Formation Deep SAU)