| TABLE 9. Carbonaceous spherule data for core SB1c, St. Bernard Parish, Louisiana. | ||||||||||
| St. Bernard core SB1c (location: 29o58"53' N, 89o55"27' W; sampled: 03/20/1996). | ||||||||||
| Percent compaction (applied linearly): 29.1. | ||||||||||
|
Sample depth (cm)1 |
Total number of carbon spherules |
Markers counted/ Total markers added during processing |
Estimated number of carbon spherules/ sediment volume (1.2 cm3)2 |
Spherule type |
||||||
| 14 | 135 | 360 / 12,542 | 4703 | oil, coal, or wood | ||||||
| 28 | 18 | 230 / 12,542 | 982 | oil, coal, or wood | ||||||
| 42 | 107 | 505 / 12,542 | 2657 | oil | ||||||
| 56 | 27 | 602 / 12,542 | 563 | oil, coal, or wood | ||||||
| 71 | 8 | 407 / 12,542 | 247 | -- | ||||||
| 85 | 2 | 594 / 12,542 | 42 | coal or wood | ||||||
| 1Compaction-corrected depth at sample midpoint. | ||||||||||
| 2Estimated number of carbon spherules per cubic centimeter of sediment (formula of Clarke and Patterson [1984]). | ||||||||||
| Source: U.S. Geological Survey Open-File Report 98-36. Carbon storage and late Holocene chronostratigraphy of a Mississippi River deltaic marsh, St. Bernard Parish, Louisiana (H.W. Markewich, ed.). | ||||||||||