plate reconstructions
... that plate reconstructions that use magnetic stripe patterns can only go back to the Jurassic period, as there is no older oceanic crust?
... that <b id="mwF0A"><a href="./Plate_reconstruction" id="mwF0E" rel="mw:WikiLink" title="Plate reconstruction">plate reconstructions</a></b> <i id="mwF0I">(example pictured)</i> that use <a href="./Magnetic_anomaly" id="mwF0M" rel="mw:WikiLink" title="Magnetic anomaly">magnetic stripe</a> patterns can only go back to the <a href="./Jurassic" id="mwF0Q" rel="mw:WikiLink" title="Jurassic">Jurassic</a> period, as there is no older <a href="./Oceanic_crust" id="mwF0U" rel="mw:WikiLink" title="Oceanic crust">oceanic crust</a>?