<div dir="ltr"><div>Yes, Barry. I heard you but I had the bit in my teeth. I apologize. Your point seemed, for me, to beg the question I was obsessed with at the moment. Where did a straight line of such scale come from? Now, I can see why a radar echo might be a straight line, but why a line of dirt? What geological process produces linear dikes? I can under why a sediment layers might be horizontal layers and I guess maybe, I can imagine that the seam between two layers might get rotated ninety degrees and then crack and then I imagine igneous rock might press up through that seam. Is that the sort oft thing you had in mind? <br></div><div><br></div><div>N<br></div><div><br></div><div>Nick <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Jun 22, 2024 at 5:38 PM Barry MacKichan <<a href="mailto:barry.mackichan@mackichan.com" target="_blank">barry.mackichan@mackichan.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><u></u>
<div><div>
<p dir="auto">Several times on the Thuram Zoom call, I asked “Do you mean that volcanic dike?” but I always seemed to say it just as someone else started up.</p>
<p dir="auto">I have two memories about it.</p>
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<li>
<p dir="auto">The president of SAR conjured up the image of 3,000 Comanches coming through the gap (Comanche Gap) as they came to Santa Fe in the 1770s to agree to the truce with New Mexico — the truce that I believe enabled the Spanish to hang on for the next 50 years in NM. The image has stuck with me.</p>
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<p dir="auto">I thought it would be a great place to find petroglyphs, and indeed it is. The density of the “No trespassing” signs along the road increases as the square of the inverse of the distance from the point where the road crosses the dike. They make it clear exactly where you should not trespass.</p>
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<p dir="auto">—Barry</p>
<p dir="auto">On 21 Jun 2024, at 11:18, Stephen Guerin wrote:</p>
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<div>Research last night on historical geologic maps got the name of that as the "Galisteo Dike". composition and description in attachment. There is one further with as well. Also known as the Creston or Comanche Gap</div>
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<div dir="auto"><a href="https://galisteo.nmarchaeology.org/sites/creston.html" target="_blank">https://galisteo.nmarchaeology.org/sites/creston.html</a><br></div>
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<div dir="auto">Basic formation given this description (chatGPT): </div>
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<div dir="auto">The Galisteo Dike is a geological formation characterized by its composition and physical properties, indicating its formation through volcanic activity. Here’s a detailed interpretation of its formation based on the description provided:</div>
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<div dir="auto">1. **Composition Analysis**: The Galisteo Dike consists of micro-monzonite, a fine-grained igneous rock. It contains a mixture of minerals including plagioclase, potassium feldspar, titan-augite, titaniferous biotite, apatite, and opaque grains in a glass groundmass. This mineral composition suggests that the dike formed from magma that cooled relatively quickly, preventing the formation of large crystals.</div>
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<div dir="auto">2. **Physical Description**: The dike appears as a dark gray, fine-grained rock with a salt and pepper texture. It weathers to dark brown or grayish brown and forms a wall-like rampart. This implies that the dike is resistant to weathering and erosion, standing out in the landscape as a prominent feature.</div>
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<div dir="auto">3. **Structural Features**: The dike is described as comprising many right echelon overlapping segments varying in length from 200 to 1200 feet and up to 18 feet thick. This pattern of overlapping segments indicates that the magma was injected into pre-existing fractures in the surrounding rock, likely under significant pressure, causing the fractures to open and propagate in an en echelon pattern.</div>
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<div dir="auto">4. **Geological Age**: The dike is dated to 26.55 million years ago, placing its formation in the Oligocene epoch. This was a time of significant tectonic activity in many parts of the world, often associated with volcanic and plutonic intrusions.</div>
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<div dir="auto">### Formation Process</div>
<div dir="auto">1. **Magma Intrusion**: The formation of the Galisteo Dike began with the intrusion of magma into fractures in the Earth's crust. The magma, originating from deeper within the mantle, was rich in the minerals described and had a high temperature, allowing it to flow and penetrate the fractures.</div>
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<div dir="auto">2. **Cooling and Crystallization**: As the magma moved upward through the fractures, it began to cool and solidify. The rapid cooling near the surface resulted in the fine-grained texture of the rock, with minerals crystallizing quickly in the groundmass of glass.</div>
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<div dir="auto">3. **Fracture Propagation**: The injection of magma caused the fractures to propagate, leading to the characteristic right echelon overlapping segments. This suggests that the fractures did not open uniformly but rather stepped along the strike, with each segment forming as a discrete intrusion event.</div>
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<div dir="auto">4. **Weathering and Erosion**: Over millions of years, the surrounding rock may have eroded away, leaving the more resistant dike exposed as a wall-like structure. The weathering of the dike itself results in the observed dark brown or grayish brown coloration.</div>
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<div dir="auto">In summary, the Galisteo Dike was formed by the intrusion of magma into fractures in the crust, followed by rapid cooling and crystallization, resulting in a fine-grained igneous rock with distinct mineral composition and structural features indicative of significant volcanic activity during the Oligocene epoch.</div>
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<div>____________________________________________<br>
CEO Founder, Simtable.com<br>
<a href="mailto:stephen.guerin@simtable.com" rel="noreferrer" target="_blank">stephen.guerin@simtable.com</a> <br>
<br>
Harvard Visualization Research and Teaching Lab<br>
<a href="mailto:stephenguerin@fas.harvard.edu" rel="noreferrer" target="_blank">stephenguerin@fas.harvard.edu</a><br>
<br>
mobile: (505)577-5828</div>
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<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Jun 21, 2024, 9:08 AM Nicholas Thompson <<a href="mailto:thompnickson2@gmail.com" rel="noreferrer" target="_blank">thompnickson2@gmail.com</a>> wrote:<br></div>
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<div>Dear Stephen,<br></div>
<div><br></div>
<div>Thank you for prompting me to respond to this inquiry. I was having some trouble getting the image to behave on my computer, and so was reluctant to wade in. </div>
<div><br></div>
<div> Indeed, just as nature abhors vacuums, she abhors straight lines, and so any line as straight as this one requires a special explanation. To me, that the line points southwestward toward the radar site NW of ABQ suggests a radar artifact, perhaps the shadow or some distant hill. As we watched the animated radar image, we could see a persistent weakness in the radar echo along that line, even as the clouds crossed it. <br></div>
<div><br></div>
<div>Speaking of abhorrent straight lines, during our conversation with Frank, we spent quite a lot of time discussing another line, a berm of sand that runs across the Galisteo Basin in roughly the same orientation, perhaps 50' high?. I had noticed this feature on topo maps and always assumed it was an old railway embankment. Frank, who knows the area well, thought that idea was absurd. So, we were left with the puzzle of a highly linear geological formation several miles long. <br></div>
<div><br></div>
<div>Could it be that this geological straight line accounts for the straight line cloud formation that Mr. Kadlubek sees? As the dry line breaks down in anticipation of the SW Monsoon, moist air does indeed move northward, following the river valleys up from TX. AT some point, it will be raised enough that its moisture is condensed leading to the release of latent heat and the further development of clouds. If the structure that raises it is a straight line, then the clouds themselves will be arranged in a straight line. We can see this effect often along linear coast lines as a sea breeze front topped by (usually) fair weather cumulus. However, given all the dramatic topography in the area, it's hard for me to imagine that this low lying feature would be determining very often.<br></div>
<div><br></div>
<div>I, too, live for the weather. I don't live for Face Book, however. So if you have any way to put in touch with Mr. Kadlubek, he and I could perhaps have coffee when I get back to Santa Fe in the fall.<br></div>
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<div>Yours faithfully,</div>
<div><br></div>
<div>Nick Thompson</div>
<div>"Behavioral Meteorologist"<br></div>
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<div dir="ltr" class="gmail_attr">On Wed, Jun 19, 2024 at 7:06 PM Stephen Guerin <<a href="mailto:stephen.guerin@simtable.com" rel="noreferrer noreferrer" target="_blank">stephen.guerin@simtable.com</a>> wrote:<br></div>
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<div>Nick, </div>
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<div dir="auto">It's your time to shine! Respond to Vince.</div>
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<div dir="auto">In the comments, local knowledge refers to it as the "prison line" as weather is different on either side of the prison on 14.</div>
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