You've got two decay products, lead and helium, and they're giving two different ages for the zircon. For this reason, ICR research has long focused on the science behind these dating techniques. These observations give us confidence that radiometric dating is not trustworthy. Research has even identified precisely where radioisotope dating went wrong. See the articles below for more information on the pitfalls of these dating methods. Radioactive isotopes are commonly portrayed as providing rock-solid evidence that the earth is billions of years old.
Questions on Radiocarbon dating?
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The term anno Domini is Medieval Latin and means "in the year of the Lord",  but is often presented using "our Lord" instead of "the Lord",   taken from the full original phrase " anno Domini nostri Jesu Christi ", which translates to "in the year of our Lord Jesus Christ ". This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus, with AD counting years from the start of this epoch and BC denoting years before the start of the era. This dating system was devised in by Dionysius Exiguus of Scythia Minor , but was not widely used until the 9th century. It is often directly contrasted to the more ancient, Anno Mundi AM conferring "in the years of the world" which recounts the ages based on biblical tradition beginning with the Creation account. To this day, it is firmly observed through virtually all Jewish religious sources, some minor non-Jewish orthodox societies, and is a reference in many aged and restituted manuscripts. The Gregorian calendar is the most widely used calendar in the world today. For decades, it has been the unofficial global standard, adopted in the pragmatic interests of international communication, transportation, and commercial integration, and recognized by international institutions such as the United Nations.
Evolution's Radiometric Dating Methods: Are they accurate?
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