or clarity's sake, here are all the C-14 dates from Tiwanaku (since the samples were collected in the late 1950s, 1980s, and 1990s, the absolute dates are approximate, ± 40 yrs)
Gak-194 (Kalasasaya, layer 6, Epoch I), 3530 ±120 BP (ca. 1530 BC)
Gak-195 (Kalasasaya, layer 5, Epoch II), 1750 ±100 BP (ca. AD 250)
B-488 (Kalasasaya, level 7 (-255cm)), 2400 ±200 BP (ca. 400 BC)
B-489 (Kalasasaya, level 7 (-270 BC)), 2530 ±200 BP (ca. 530 BC)
B-490 (Kalasasaya, level 6, layer 4), 2100 ±120 BP (ca. 100 BC)
ETH-5639 (Akapana), 1090 ±60 BP (ca. AD 910)
ETH-5640 (Akapana), 1090 ±85 BP (ca. AD 910)
Gak-51 (Kalasasaya, layer 3), 630 ±110 BP (ca. AD 1370)
Gak-52 (Kalasasaya, layer 6), 2190 ±130 BP (ca. 190 BC)
Gak-53 (Kalasasaya, layer 6), 2410 ±140 BP (ca. 410 BC)
Gak-192 (Kalasasaya, upper part of layer 7, Epoch I), 1990 ±110 BP (ca. AD 10)
Gak-193 (Kalasasaya, lower part of layer 7, Epoch I), 1850 ±90 BP (ca. AD 150)
Hv-17 (Kalasasaya, 50 cm depth on platform), 240 ±80 BP (ca. AD 1760)
Hv-18 (Kalasasaya, 175 cm depth on platform), 1630 ±130 BP (ca. AD 370)
Hv-19 (Kalasasaya, 180 cm depth on platform), 1645 ±80 BP (ca. AD 355)
INAH-972 (Akapana), 1120 ±140 (ca. AD 980)
P-119 (Tiwanaku, level 8, 2.3 - 2.85 m down), 1460 ±200 BP (ca. AD 540)
P-120 (Tiwanaku, level 9, 2.0-2.25m down), 1702 ±103 BP (ca. AD 308)
P-120A (Tiwanaku, levels 8-10, 1.75 to 2.5 m down), 1226 ±100 BP (ca. AD 774)
P-121 (Tiwanaku, levels 6 and 7, 1.25-1.75 m down, associated with classic Tiwanaku pottery), 1423 ±175 BP (ca. AD 577)
P-123 (Tiwanaku, level 15, 3.5 to 3.75 m down; digging continued for 4.74m below with no pottery below 4m), 1817 ±103 BP (ca. AD 183)
P-146 (Tiwanaku, level 1 0.0-0.75 m down), 949 ±98 BP (ca. AD 1151)
P-147 (Tiwanaku, levels 6 and 7, 1.8-2.3 m down), 1576 ±104 BP (ca. AD 424)
P-149 (Tiwanaku, level 12, 2.75-3.0 m down), 1701 ±93 BP (ca. AD 299)
P-150 (Tiwanaku, levels 14, 3.25-3.5 m down), 1692 ±104 BP (ca. AD 308)
P-531 (Kalasasaya, 85-100 cm deep), 295 ±192 BP (ca. AD 1705)
P-532 (Kalasasaya, 3.64 m down), 1653 ±61 BP (ca. AD 447)
P-533 (Kalasasaya, 1.1-1.35 m down), 778 ±133 BP (ca. AD 1222)
P-532 (Kalasasaya, 2.15-2.17 m down), 1866 ±62 BP (ca. AD 234)
It is noteworthy how all the dates are so consistent, falling mostly in the era of ca. AD 100-900. Within each series, too, the dates are consistent: the GaK and B series have the earliest dates drawn from the lower levels of the Kalasasaya (further corroborated by the P-500 series, also from the Kalasasaya); the HV series has the anomolous later date (but not the only one, cf. P-531); even with series, the dates are as one would expect, e.g. the deeper one goes in the P-100 series, the older the dates tend to become (with fluctuations, to be sure, but not unaccountable for by the deviations).