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1. Site U1561

   Coggon, R.M. ; Sylvan, J.B. ; Estes, E.R. ; Teagle, D.A.H. ; Reece, J. ; Williams, T.J. ; Christeson, G.L. ; Aizawa, M. ; Borrelli, C. ; Bridges, J.D. ; et al ( January 2024 , Proceedings of the International Ocean Discovery Program Expedition reports)

   Site U1561 (30˚43.2902′S, 26˚41.7162′W; proposed Site SATL-55A) is in the central South Atlantic Ocean at a water depth of 4910 meters below sea level (mbsl) ~1250 km west of the Mid-Atlantic Ridge (see Figure F1 and Tables T1, T2, all in the Expedition 390/393 summary chapter [Coggon et al., 2024d]) on crust that formed at a slow half spreading rate of ~13.5 mm/y, which is the slowest spreading rate in the study region (Kardell et al., 2019; Christeson et al., 2020; see Figure F7 in the Expedition 390/393 summary chapter [Coggon et al., 2024d]). With an estimated age of 61.2 Ma, Site U1561 is the oldest location of the South Atlantic Transect (SAT) campaign (International Ocean Discovery Program [IODP] Expeditions 390C, 395E, 390, and 393). Site U1561 sits on a basement ridge and is therefore less heavily sedimented than Sites U1556 and U1557, which are located ~25 km south of Site U1561 on 61.2 and 60.7 Ma ocean crust, respectively. Together, all sites in this region allow for investigation of the effect of sediment thickness on crustal evolution. 

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2. Site U1556

   Coggon, R.M. ; Sylvan, J.B. ; Estes, E.R. ; Teagle, D.A.H. ; Reece, J. ; Williams, T.J. ; Christeson, G.L. ; Aizawa, M. ; Borrelli, C. ; Bridges, J.D. ; et al ( January 2024 , Proceedings of the International Ocean Discovery Program Expedition reports)

   Site U1556 (30°56.5244′S, 26°41.9472′W; proposed Site SATL-53B) is in the central South Atlantic Ocean at a water depth of 5002 meters below sea level (mbsl) ~1250 km west of the Mid-Atlantic Ridge (see Figure F1 and Tables T1, T2, all in the Expedition 390/393 summary chapter [Coggon et al., 2024d]) on crust that formed at a slow half spreading rate of ~13.5 mm/y, which is the slowest spreading rate in the study region (Kardell et al., 2019; Christeson et al., 2020) (see Figure F7 in the Expedition 390/393 summary chapter [Coggon et al., 2024d]). With an estimated age of 61.2 Ma, Site U1556 is the oldest location of the South Atlantic Transect (SAT) campaign (International Ocean Discovery Program [IODP] Expeditions 390C, 395E, 390, and 393). Site U1556 is less heavily sedimented than Site U1557, which is located 6.5 km east of Site U1556 on 60.7 Ma ocean crust. Together, both sites allow for investigation of the effect of sediment thickness on crustal evolution. 

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3. Site U1560

   Teagle, D.A.H. ; Reece, J. ; Williams, T.J. ; Coggon, R.M. ; Sylvan, J.B. ; Estes, E.R. ; Christeson, G.L. ; Albers, E. ; Amadori, C. ; Belgrano, T.M. ; et al ( January 2024 , Proceedings of the International Ocean Discovery Program Expedition reports)

   Site U1560 (30°24.2057′S, 16°55.3702′W; proposed Site SATL-25A) is in the central South Atlantic Ocean at a water depth of ~3723 meters below sea level (mbsl), ~315 km west of the Mid-Atlantic Ridge in the low-productivity South Atlantic Gyre (see Figure F1 and Tables T1, T2, all in the Expedition 390/393 summary chapter [Coggon et al., 2024b]). The crust formed at an intermediate half spreading rate of ~25.5 mm/y, which is the highest spreading rate in the study region (Kardell et al., 2019; Christeson et al., 2020) (see Figure F7 in the Expedition 390/393 summary chapter [Coggon et al., 2024b]). With an estimated age of 15.2 Ma, Site U1560 is the second youngest location of the South Atlantic Transect (SAT) campaign (International Ocean Discovery Program [IODP] Expeditions 390C, 395E, 390, and 393). Site U1560 is similar in age but is in a contrasting environment to the deep drilling at Ocean Drilling Program (ODP)/Integrated Ocean Drilling Program superfast Site 1256 (Wilson et al., 2006; Expedition 309/312 Scientists, 2006; Expedition 335 Scientists, 2012), which is on crust that formed at the East Pacific Rise during an episode of superfast spreading rate in a region of high pelagic productivity and rapid sedimentation (Shipboard Scientific Party, 2003). 

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4. Site U1583

   Teagle, D.A.H. ; Reece, J. ; Williams, T.J. ; Coggon, R.M. ; Sylvan, J.B. ; Estes, E.R. ; Christeson, G.L. ; Albers, E. ; Amadori, C. ; Belgrano, T.M. ; et al ( January 2024 , Proceedings of the International Ocean Discovery Program Expedition reports)

   Site U1583 (30°42.6175′S, 20°26.0336′W; proposed Site SATL-33B) is in the central South Atlantic Ocean at a water depth of ~4210 meters below sea level (mbsl), ~652 km west of the Mid-Atlantic Ridge (see Figure F1 and Tables T1, T2, all in the Expedition 390/393 summary chapter [Coggon et al., 2024b]) on crust that formed at an intermediate half spreading rate of ~24 mm/y, which is close to the highest spreading rate in the study region (Kardell et al., 2019; Christeson et al., 2020) (see Figure F7 in the Expedition 390/393 summary chapter [Coggon et al., 2024b]). With an estimated age of 30.6 Ma, Site U1583 is close to the median age of the South Atlantic Transect (SAT) campaign (International Ocean Discovery Program [IODP] Expeditions 390C, 395E, 390, and 393), and it is closest to the geographic midpoint. 

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5. Site U1559

   Coggon, R.M. ; Teagle, D.A.H. ; Sylvan, J.B. ; Reece, J. ; Estes, E.R. ; Williams, T.J. ; Christeson, G.L. ; Aizawa, M. ; Albers, E. ; Amadori, C. ; et al ( January 2024 , Proceedings of the International Ocean Discovery Program Expedition reports)

   Site U1559 (30°15.6336′S, 15°02.0941′W; proposed Site SATL-13A) is in the central South Atlantic Ocean at a water depth of 3055 meters below sea level (mbsl), ~130 km west of the Mid-Atlantic Ridge (see Figure F1 and Tables T1, T2, all in the Expedition 390/393 summary chapter [Coggon et al., 2024d]) on crust that formed at a slow half-spreading rate of ~17.0 mm/y (Kardell et al., 2019; Christeson et al., 2020) (see Figure F7 in the Expedition 390/393 summary chapter [Coggon et al., 2024d]). With an estimated age of 6.6 Ma, Site U1559 is the youngest location of the South Atlantic Transect (SAT) campaign (International Ocean Discovery Program [IODP] Expeditions 390C, 395E, 390, and 393). 

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