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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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<blockquote data-quote="user 4386" data-source="post: 289737" data-attributes="member: 4386"><p>Lefty, this might interest you if you don't have it. It is a description of how the Mt Hay thunder-eggs form. I would reckon that the agates on the Fitzroy River near the weir are probably derived from the same group of Cretaceous volcanics (rhyolites and basalts) that extend far west from Mt Hay if you look at the first map, and probably into the heads of the west-flowing tributaries of the Fitzroy River. This belt of plugs and flows extend north and south from here and would probably shed into the river elsewhere (eg for 35 km from Mt Salmon to Native Cat Range, including Mt Lion). I imagine that they are supllying agates in various areas. Agates etc might be more abundant in drainages feeding the Fitzroy River from the east.</p><p></p><p>Sorry, too large for this site - if you want it let me know and I will reduce the file size. Here is the map anyway. Note that basalts are extensive in the area, and I suspect your pet wood may be coming from gravels beneath the basalts. The mistake I made was only searching for Tertiary basalts in your area - I forgot that your area was among the earliest to move over the hot spot, so that the hot spot basalts extend back as far as the Cretaceous in your area.</p><p></p><p><img src="https://www.prospectingaustralia.com/forum/img/member-images/4386/1478922445_mthay.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="user 4386, post: 289737, member: 4386"] Lefty, this might interest you if you don't have it. It is a description of how the Mt Hay thunder-eggs form. I would reckon that the agates on the Fitzroy River near the weir are probably derived from the same group of Cretaceous volcanics (rhyolites and basalts) that extend far west from Mt Hay if you look at the first map, and probably into the heads of the west-flowing tributaries of the Fitzroy River. This belt of plugs and flows extend north and south from here and would probably shed into the river elsewhere (eg for 35 km from Mt Salmon to Native Cat Range, including Mt Lion). I imagine that they are supllying agates in various areas. Agates etc might be more abundant in drainages feeding the Fitzroy River from the east. Sorry, too large for this site - if you want it let me know and I will reduce the file size. Here is the map anyway. Note that basalts are extensive in the area, and I suspect your pet wood may be coming from gravels beneath the basalts. The mistake I made was only searching for Tertiary basalts in your area - I forgot that your area was among the earliest to move over the hot spot, so that the hot spot basalts extend back as far as the Cretaceous in your area. [img]https://www.prospectingaustralia.com/forum/img/member-images/4386/1478922445_mthay.jpg[/img] [/QUOTE]
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Gemstones, Minerals & Fossils
Gemstones and Minerals
unknown find from slatey
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