I mistakenly identified Valdivia in Chile for the Valdivian Culture in Ecuador in my post on American C haplogroup. A kind reader pointed out my error (Thanks! one learns from ones mistakes) and this mini post is the outcome.
An article (Estrada, E., B.J. Meggers y C. Evans 1962. Possible transpacific contact on the coast of Ecuador. Science 135:371-372.) suggested that the Japanese Jomon reached Ecuador (a stray fishermen's boat perhaps) and transmitted some of their culture to the local Valdivian Amerindians.
A clear example used to suppoert this theory is the incise pottery, shown below. Valdivian on the left, Jomon on the right:
Incised pottery is not rare, it is a global phenomenon, for examples of incised ceramics in other parts of the world see the Amerindian Guaraní in Buenos Aires, prehistoric Spain or Native Americans in the U.S or Sudan in Africa.
It was assumed that the Valdivian pottery appeared with this novel incise pattern all of a sudden and that it could be explained via a transpacific contact. However an older Valdivian pottery dated at 3,500 BCE more rudimentary and obviously local must have been the source of the later more complex ceramics. 
And then we have the "Venus" images. The Jomon made humanoid dolls in clay of different sizes and shapes, they span a long period from c. 10 to 2.3 kya. They were once thought to be fertility symbols, but may have been dolls. One is shown below. Clearly a voluptuous female with curves.
The Valdivians made their own Venus ceramics as from 3,100 BCE. Shonwn below, and clearly slimmer and differently styled. Why would the Jomon transmit their incised pottery but not their obese Venuse dolls? Simply because there were no Jomons in Ecuador.
The Jomons in Ecuador still would not explain how Japanese C3* haplotpe got into the genome of Colombian natives. Furthermore the C3* in Colombian and Ecuadorian natives is not the same as the Jomon haplotypes.
 Henning Bischof and Julio Viteri Gamboa, (2006) Entre Vegas y Valdivia: la fase San Pedro en el suroeste del Ecuador. Bulletin de l’Institut Français d’Études Andines / 2006, 35 (3): 361-376 IFEA
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