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Our geologist would be very happy with this result.He would say that the date represents the time when the volcanic lava solidified.Thus, he already ‘knows’ that the igneous dyke must be younger than 200 million years and older than 30 million years.(Creationists do not agree with these ages of millions of years because of the assumptions they are based on.) Because of his interest in the volcanic dyke, he collects a sample, being careful to select rock that looks fresh and unaltered.Here he can see that some curved sedimentary rocks have been cut vertically by a sheet of volcanic rock called a dyke.It is clear that the sedimentary rock was deposited and folded before the dyke was squeezed into place.He may suggest that the rock contained crystals (called xenocrysts) that formed long before the rock solidified and that these crystals gave an older date.He may suggest that some other very old material had contaminated the lava as it passed through the earth.
by Tas Walker A geologist works out the relative age of a rock by carefully studying where the rock is found in the field.Sign up for INFObytes and receive an MP3 (audio presentation) called Genesis, The Gospel and the Creation/Evolution Issue by Dr Emil Silvestru—free for you to download! Fw-300 #ya-qn-sort h2 /* Breadcrumb */ #ya-question-breadcrumb #ya-question-breadcrumb i #ya-question-breadcrumb a #bc .ya-q-full-text, .ya-q-text #ya-question-detail h1 html[lang="zh-Hant-TW"] .ya-q-full-text, html[lang="zh-Hant-TW"] .ya-q-text, html[lang="zh-Hant-HK"] .ya-q-full-text, html[lang="zh-Hant-HK"] .ya-q-text html[lang="zh-Hant-TW"] #ya-question-detail h1, html[lang="zh-Hant-HK"] #ya-question-detail h1 /* Trending Now */ /* Center Rail */ #ya-center-rail .profile-banner-default .ya-ba-title #Stencil . Bgc-lgr .tupwrap .comment-text /* Right Rail */ #Stencil . By looking at other outcrops in the area, our geologist is able to draw a geological map which records how the rocks are related to each other in the field.From the mapped field relationships, it is a simple matter to work out a geological cross-section and the relative timing of the geologic events.
On his return, he sends his sample to the laboratory for dating, and after a few weeks receives the lab report.