I do not have access to the specific article in Science, Volume 391, Number 6791 of March 2026 that you have listed. The search results provided include articles on ancient zircons and plate tectonics, but not exactly the article titled "Ancient rocks reveal early plate motions" from Science. In order to create an accurate and factual summary as per your requirements, I would need access to the full text of this particular article. Without it, I could not guarantee that the summary would contain only verified facts from the given source. If you have the text of the article or its abstract available, I would like to process it according to your specifications.