Revision History for Circular 1386 

U.S. Geological Survey

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

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Revised and reposted on September 24, 2013, as Circular 1386, 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. Minor changes were made to the affected values in 
tables 1, 2, 3, and 4 and figures 1B, 6, and 7E. The Norphlet Formation Deep was 
listed as the 9th largest SAU in the original report (p. 15), yet it is now no longer 
in the top 10. This change makes the 9th largest SAU the Yegua and Cockfield Formations 
of the U.S. Gulf Coast and makes the 10th largest SAU the Winnipegosis Formation, 
Interlake Formation, and Bighorn Group of the Williston Basin. In addition, figure 3 
was replaced to show the minor changes in the Michigan Basin and U.S. Gulf Coast and 
the correct bounds for the Arkoma and Wind River Basins.

List of changes 
Table 1: 1 change in P5 of the TASR
Figure 1B: 1 change in the TASR of the Coastal Plains Region
Figure 2: removal of drafting artifacts
Figure 3: slight redrafting to show the minor changes in the Michigan Basin 
   and U.S. Gulf Coast and the correct bounds for the Arkoma and Wind River Basins
Table 2: 10 changes for the Eastern Mid-Continent Region and its Michigan Basin 
   and the Coastal Plains Region and its U.S. Gulf Coast
Figure 6: 1 change in P5 of the TASR
Figure 7E: 1 change in the TASR of the Coastal Plains Region
Page 15, item 3: 1 change in the TASR of the Coastal Plains Region
Page 15, item 5: 1 change in the resources in the deep SAUs
Page 15, item 6: reorganization of 2 of the top 10 SAUs 
Table 3: 68 changes for the Michigan Basin and its Dundee Formation SAU and for the 
   U.S. Gulf Coast and its Norphlet Formation, Norphlet Formation Deep, Smackover Formation, 
   and Smackover Formation Deep SAUs
Table 4:  1 change in the TASR of deep SAUs in the U.S. Gulf Coast and, consequently, 
   1 change in the total