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Chiapas Amber (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Polished): Weight: 11.4g Dimensions: 30x31x17mm Lighting: 140lm LED About the Specimen: This is the same specimen from other entries, but with polished faces that were once broken. The thick, red oxidized layer was formed over millions of years through oxidation during the amber's burial. The blue and blue-green fluorescence is due to exposure of the amber's hydrocarbons to UV wavelengths in the LED light. An excellent display of color zoning, this close-up image better shows the transition between oxidized and unoxidized layers, as well as strong fluorescence under LED light. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Polished): Weight: 11.4g Dimensions: 30x31x17mm Lighting: 140lm LED About the Specimen: This is the same specimen from other entries, but with polished faces that were once broken. The thick, red oxidized layer was formed over millions of years through oxidation during the amber's burial. The blue and blue-green fluorescence is due to exposure of the amber's hydrocarbons to UV wavelengths in the LED light. An excellent display of gradual color zoning, this image shows the transition between oxidized and unoxidized layers, as well as strong fluorescence under LED light. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Polished): Weight: 11.4g Dimensions: 30x31x17mm Lighting: 140lm LED About the Specimen: This is the same specimen from other entries, but with polished faces that were once broken. The thick, red oxidized layer was formed over millions of years through oxidation during the amber's burial. The blue and blue-green fluorescence is due to exposure of the amber's hydrocarbons to UV wavelengths in the LED light. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Polished): Weight: 11.4g Dimensions: 30x31x17mm Lighting: Longwave UV (365nm) About the Specimen: This is the same specimen from other entries, but with polished faces that were once broken. Numerous flow lines are seen in a radiating "Y" pattern on the bottom-left section of the specimen: the spaces between the lines represent individual resin layers that were produced in succession by the tree. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Polished): Weight: 11.4g Dimensions: 30x31x17mm Lighting: 140lm LED About the Specimen: This is the same specimen from other entries, but with polished faces that were once broken. The thick, red oxidized layer was formed over millions of years through oxidation during the amber's burial. Transmitted light (LED) from the rear of the specimen displays the depth of the color of the oxidized layer. Round, dark spots in the center of the specimen represent the fossilized barnacles attached to the opposite end of the specimen's rough exterior. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Polished): Weight: 11.4g Dimensions: 30x31x17mm Lighting: 140lm LED About the Specimen: This is the same specimen from other entries, but with polished faces that were once broken. The thick, red oxidized layer was formed over millions of years through oxidation during the amber's burial. The blue and blue-green fluorescence is due to exposure of the amber's hydrocarbons to UV wavelengths in the LED light; numerous flow lines are seen in a radiating "Y" pattern, and are especially fluorescent: the spaces between the lines represent individual resin layers that were produced in succession by the tree. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber w/ Fossil Barnacles (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Rough): Weight: 11.8g Dimensions: 33x31x17mm Lighting: Longwave UV (365nm) About the Specimen: There are numerous fossil barnacles and barnacle scars, coating the exterior of the specimen. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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- amber
- chiapas amber
- (and 17 more)
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Chiapas Amber w/ Fossil Barnacles (La Quinta Fm./Mazantic Shale [Simojovel Group], 22.8-15 Ma)
Barrelcactusaddict posted a gallery image in Member Collections
From the album: Fossil Amber and Copal: Worldwide Localities
Chiapas Amber Simojovel, Chiapas, Mexico La Quinta Fm./Mazantic Shale (Simojovel Group) 22.8-15 Ma Specimen (Rough): Weight: 11.8g Dimensions: 33x31x17mm Lighting: 140lm LED About the Specimen: There are numerous fossil barnacles and barnacle scars, coating the exterior of the specimen. History: The amber of Chiapas has a history of use that dates back to the age of the Maya Empire; amber was traded between different tribes, and sometimes sent as an annual tribute to other nations (i.e., Aztec Empire). It was frequently fashioned into ornaments and jewelry such as necklaces, as well as lip, nose, and ear plugs; living descendants of the Mayan civilization carry on this ancient tradition, and skilled artisans fashion amber into similar jewelry, and sculptures of intricate detail. Botanical Source: Through Carbon-13 Nuclear Magnetic Resonance Spectroscopy, as well as the presence of fossil leaves and flowers, the source trees of Chiapas amber have been identified as two extinct species belonging to the Hymenaea genus (Subfamily: Caesalpinioideae): H. mexicana and H. allendis; both trees are related to H. protera, which produced Dominican amber. The closest living relative of these three extinct genera is H. verrucosa, which is native to East Africa. Geology of Deposits: The Sierra Madre del Sur contains three amber-bearing Formations, beginning at the youngest: Balumtun Sandstone, Mazantic Shale, and La Quinta Fm.; amber is most frequently found in the Mazantic Shale and La Quinta Formations, and is associated with layers of lignite, and found in calcareous marine sandstones, siltstones, and shales. Amber specimens up to 60cm long are known to occur at the Campo La Granja mines. Sources: “Amber From Chiapas: A Gem With History”; Universidad Nacional Autónoma de México, Voices of Mexico, No. 72; Lynneth S. Lowe 2005 “Mexican amber history”; Mayan Copal (website blog), March 29, 2018 “Early Miocene amber inclusions from Mexico reveal antiquity of mangrove-associated copepods”; Scientific Reports, Issue 6; Rony Huys, et. al. 2016 “Hymenaea mexicana sp. nov. (Leguminosae: Caesalpinioideae) from Mexican amber indicates Old World connections”; Botanical Journal of the Linnean Society, Issue 139, pp. 125-132; George Poinar Jr., Alex E. Brown 2002© Kaegen Lau
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An interesting web page on fake trilobites. Fake Trilobites, American Museum of Natural History https://www.amnh.org/research/paleontology/collections/fossil-invertebrate-collection/trilobite-website/the-trilobite-files/fake-trilobites Yours, Paul H.
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Whenever I bring home a new batch of fossils, I pull out my UV rock lamp. Why? Some fossils glow in the dark, but not in a uniform way. Variations in the mineral composition make for a variety of colors, even when the specimen seems fairly uniform in color in daylight. This can make small, hidden details really stand out. Case in point: This afternoon I was putting away some petrified wood I'd collected awhile back. I pulled out my black light to examine them because some of the wood from this site shows a rainbow of color under UV. This one particular piece was mostly orange under UV, though in camera the hues look different. What really got my attention, however, were a few really vibrant spots on one side. Insect traces! The petrified wood chip is only about 8 cm long. Even with a magnifier, some of the small details are hard to spot. I never would have spotted them in daylight, but they were super bright with the UV. Another box I was sorting through this week contained impressions of brachiopods and trilobites in plain, white limestone. It can be hard to see the contours in the matrix, but they show up much differently under the UV. Finally, UV light can be used to identify fossil mollusks whose patterns have bleached away. About 60% of fossil shells fluoresce and some species have been described based on the residual patterns made visible under ultraviolet light. Note: To photograph these, I used a Convoy UV LED flashlight. I set my camera on a tripod for a 4 second exposure at f/22, with ISO set to 1600. I had my DSLR's white balance set for daylight.
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