Table 1.

Summary of dated corals from Mo‘orea marae

LocationSample no.*GeneraForm“Zero-age” surface presentCalcite (wt%)Low [U]Anom. 234U/238U232Th pg/gDate (AD)Error (y, 2σ)Preferred date (AD)Error (y, 2σ)
Coast, Nu‘urua (Emory site 82)
82-APorites1Yes14717339.917434.0
82-BPorites1Yes156174711.0
82-CPorites1Yes117174714.0
82-DPorites1Yes33917435.7
82-EPorites1Yes236174910.7
Coast, Nu‘upure (Emory site 91)
91-A-1aAcropora1Yes0.130117676.1176110
91-A-1b42617636.3
91-A-2Acropora1Yes0.01,425175311.9
91-BAcropora1Yes0.034617468.4
91-C-2Porites2Yes0.049717638.2
Coast, Umarea (Emory site 92)
92-BaPorites1Yes43817666.0176110
92-Bb217176312.5
92-C-1aPorites1Yes17817595.5
92-C-1b165169713.2
92-C-2Pocillopora1Yes32917508.6
‘Opunohu Valley (ScMo-#)
105-1Porites2Yes0.028016869.216869.2
105-3Porites2Yes5.2897173618.9
106A-2Porites2Yes0.03,450172618172618
106A-3aPorites2Yes0.0404169911
106A-3b1,005165915.1
106A-3c2,152168118.0
106J-3Porites2Yes0.04,237161425.8163325
106J-4Porites2Yes0.03,411165220.4
123BAcropora3No0.0X25316179.41617§9.4
124D-1Porites2Yes1.9X223169011.91690§12
124D-3aPorites2No0.0879158510.3
124D-3b1,464157411.5
124D-3c2,928157921.8
124 H-CS1Acropora4No0.0X11616914.31691§3.1
124 H-CS2Acropora4NoX10616904.8
124I-1Porites2Yes0.0668168714.3169011
124I-3Porites2Yes0.31,995169416.3
124J-2aPorites2Yes0.2866173312.4172316
124J-2b1,950172621.4
124J-3Porites2Yes0.053817137.7
124Q-2Porites2Yes0.042016865.716865.7
124S-1Porites2Yes4.776416849.7169427
124S-2Porites2Yes0.04,258169426.6
125A-2Acropora3YesX48163719.21637§19
125B-1Acropora4Yes0.014116665.917084.2
125B-2Acropora4No0.025616297.3
125B-3Acropora4No0.0246160513.5
125B-4Porites2Yes0.031217109.2
125B-5Porites2Yes0.215317067.5
125B-6aPorites2Yes0.08417128.9
125B-6b29017079.0
125E-3Acropora3No0.0X71170810.11708§10
125F-1Porites2Yes0.04,850170630.0170630
125F-2Porites2Yes2.3465171112.0
125F-3Acropora4No0.044145312.8
128–1Acropora3Yes0.0X13816848.61684§8.6
144-I-1Acropora4Yes0.0XX548163717.51637§17
144J-1Acropora4No0.0X579163417.41634§18
144L-2Porites2Yes0.01057173716.4173011
144L-3Porites2Yes0.0628172415.4
144M-1Porites2Yes4.61,95216628.91662§8.9
  • *Sample numbers at coastal marae correspond to site numbering of Emory (9); sample numbers at ‘Opunohu Valley sites correspond to numbering of Green and Descantes (17). Suffixes -a, -b, or -c denote replicate analyses of single coral.

  • Form and architectural occurrence of dated coral: 1, head of Porites or Acropora stacked to form ahu; 2, cut-and-dressed Porites block (with nonworked inner faces) forming ahu façade; 3, “fan coral” head of Acropora set on end to form facade of ahu; 4, nonarchitectural offering of Acropora placed on ahu.

  • Anomalous initial 234U/238U activity ratio (i.e., 234U/238U ratio, back-calculated from 230Th/U age, is not equal to 1.147 ± 0.007).

  • §Date is of low reliability, on the basis of geochemical properties of dated coral (i.e., calcite content, [U], and initial 234U/238U ratio).