Welcome back to #TrilobiteTuesday
Here is Asaphus lepidurus from the Middle Ordovician rocks of St. Petersburg, Russia. Trilobites from these limestones have a beautiful caramel colored shell and are preserved three-dimensionally!
Here is Asaphus lepidurus from the Middle Ordovician rocks of St. Petersburg, Russia. Trilobites from these limestones have a beautiful caramel colored shell and are preserved three-dimensionally!
February 10, 2026 at 10:13 PM
Welcome back to #TrilobiteTuesday
Here is Asaphus lepidurus from the Middle Ordovician rocks of St. Petersburg, Russia. Trilobites from these limestones have a beautiful caramel colored shell and are preserved three-dimensionally!
Here is Asaphus lepidurus from the Middle Ordovician rocks of St. Petersburg, Russia. Trilobites from these limestones have a beautiful caramel colored shell and are preserved three-dimensionally!
The Stacks at Downpatrick Head, Ireland, date back 350 million years are made of limestones and shales. The thin dark layers are shale formed by mud deposits, the medium layers are sandstones, while the white thick layers are limestones and made of seashells.
December 20, 2025 at 3:43 AM
The Stacks at Downpatrick Head, Ireland, date back 350 million years are made of limestones and shales. The thin dark layers are shale formed by mud deposits, the medium layers are sandstones, while the white thick layers are limestones and made of seashells.
Welcome back to #TrilobiteTuesday!
Here is the cephalon of the "lace collar" trilobite Cryptolithus tessellatus. This comes from the Upper Ordovician Kope Formation (Lower Cincinnatian Series) in Maysville, Kentucky. What you usually find are just pieces scattered throughout the limestones.
Here is the cephalon of the "lace collar" trilobite Cryptolithus tessellatus. This comes from the Upper Ordovician Kope Formation (Lower Cincinnatian Series) in Maysville, Kentucky. What you usually find are just pieces scattered throughout the limestones.
February 3, 2026 at 4:08 PM
Welcome back to #TrilobiteTuesday!
Here is the cephalon of the "lace collar" trilobite Cryptolithus tessellatus. This comes from the Upper Ordovician Kope Formation (Lower Cincinnatian Series) in Maysville, Kentucky. What you usually find are just pieces scattered throughout the limestones.
Here is the cephalon of the "lace collar" trilobite Cryptolithus tessellatus. This comes from the Upper Ordovician Kope Formation (Lower Cincinnatian Series) in Maysville, Kentucky. What you usually find are just pieces scattered throughout the limestones.
The rocks at the very top of Mount Everest, almost nine kilometres above sea level, are fossil-rich limestones deposited in a shallow marine sea 450 million years ago.
That's what plate tectonics can do.
That's what plate tectonics can do.
February 14, 2025 at 3:29 AM
The rocks at the very top of Mount Everest, almost nine kilometres above sea level, are fossil-rich limestones deposited in a shallow marine sea 450 million years ago.
That's what plate tectonics can do.
That's what plate tectonics can do.
Mount Rundle is a mountain in Banff National Park that overlooks the towns of Banff and Canmore in the Canadian province of Alberta. Geologically, it consists of limestones, dolomitic limestones, dolomites and shales of Paleozoic age.
June 7, 2025 at 3:37 PM
Mount Rundle is a mountain in Banff National Park that overlooks the towns of Banff and Canmore in the Canadian province of Alberta. Geologically, it consists of limestones, dolomitic limestones, dolomites and shales of Paleozoic age.
All hands on the great unconformity in the Sandias, New Mexico. Pennsylvianian limestones on 1.4 billion years A type granites. @riceuniversity.bsky.social geology trip.
October 12, 2025 at 3:47 AM
All hands on the great unconformity in the Sandias, New Mexico. Pennsylvianian limestones on 1.4 billion years A type granites. @riceuniversity.bsky.social geology trip.
In Castleton, the home of the purple fluorite variety Blue John, you can find purple fluorite on the building stones which are Asbian-Brigantian age limestones fossil rich limestones #urbangeology
June 2, 2025 at 8:07 AM
In Castleton, the home of the purple fluorite variety Blue John, you can find purple fluorite on the building stones which are Asbian-Brigantian age limestones fossil rich limestones #urbangeology
Welcome back to #TrilobiteTuesday
Here is Drotops megalomanicus. This comes from the Middle Devonian (Eifelian) limestones in Jebel Issoumour, Morocco. The white line is a vein of calcite running through the rock and the trilobite. If happened after the trilobite became a fossil.
Here is Drotops megalomanicus. This comes from the Middle Devonian (Eifelian) limestones in Jebel Issoumour, Morocco. The white line is a vein of calcite running through the rock and the trilobite. If happened after the trilobite became a fossil.
March 31, 2026 at 3:23 PM
Welcome back to #TrilobiteTuesday
Here is Drotops megalomanicus. This comes from the Middle Devonian (Eifelian) limestones in Jebel Issoumour, Morocco. The white line is a vein of calcite running through the rock and the trilobite. If happened after the trilobite became a fossil.
Here is Drotops megalomanicus. This comes from the Middle Devonian (Eifelian) limestones in Jebel Issoumour, Morocco. The white line is a vein of calcite running through the rock and the trilobite. If happened after the trilobite became a fossil.
Sigmoidal structures (S-C structures) developed in deformed limestones within the Tellare fault. What's remarkable is the presence of white tensional veins (white) oblique to shear planes and parallel to the [theoretical] sigma 1.
See first comment for a sense of scale.
⚒️ #geology
See first comment for a sense of scale.
⚒️ #geology
February 9, 2026 at 2:11 PM
Sigmoidal structures (S-C structures) developed in deformed limestones within the Tellare fault. What's remarkable is the presence of white tensional veins (white) oblique to shear planes and parallel to the [theoretical] sigma 1.
See first comment for a sense of scale.
⚒️ #geology
See first comment for a sense of scale.
⚒️ #geology
#TerrierTuesday today I give you #geodog Pebble and @speleoseb.bsky.social investigeting Gloucestershire limestones and Yorkshire sandstones at #HigherGround 🐾🥾⚒️🪨
July 22, 2025 at 9:14 AM
#TerrierTuesday today I give you #geodog Pebble and @speleoseb.bsky.social investigeting Gloucestershire limestones and Yorkshire sandstones at #HigherGround 🐾🥾⚒️🪨
A lone tree has a special way of making the landscape feel more dramatic 🌳.
#photography #sunrise #lonetree #limestones #yorkshire #yorkshiredales #malham
#photography #sunrise #lonetree #limestones #yorkshire #yorkshiredales #malham
January 7, 2025 at 10:52 PM
A lone tree has a special way of making the landscape feel more dramatic 🌳.
#photography #sunrise #lonetree #limestones #yorkshire #yorkshiredales #malham
#photography #sunrise #lonetree #limestones #yorkshire #yorkshiredales #malham
limestones always right
November 13, 2023 at 11:34 PM
limestones always right
#paleontology #fossil #help anyone knows these from Carboniferous dark #crinoid #limestones? Ardennes ⚒️ #geology
September 27, 2026 at 10:18 AM
#paleontology #fossil #help anyone knows these from Carboniferous dark #crinoid #limestones? Ardennes ⚒️ #geology
#FridayFold folded Sinemurian limestones at Punta delle Rocchette, Southern Tuscany, Italy
#geology #tectonics #structuralgeology
#geology #tectonics #structuralgeology
February 6, 2026 at 7:55 AM
#FridayFold folded Sinemurian limestones at Punta delle Rocchette, Southern Tuscany, Italy
#geology #tectonics #structuralgeology
#geology #tectonics #structuralgeology
Erophila verna, Common Whitlowgrass 💚
On the Carboniferous limestones of the White Peak.
#wildflowerhour in the #PeakDistrict National Park.
On the Carboniferous limestones of the White Peak.
#wildflowerhour in the #PeakDistrict National Park.
March 22, 2026 at 8:17 PM
Erophila verna, Common Whitlowgrass 💚
On the Carboniferous limestones of the White Peak.
#wildflowerhour in the #PeakDistrict National Park.
On the Carboniferous limestones of the White Peak.
#wildflowerhour in the #PeakDistrict National Park.
October 19, 2025 at 7:20 PM
I just love the mid-century Derbydene Marble fossil walls in the Royal Festival Hall on London’s South Bank. Whopping big crinoids from the Eyam Limestone Formation. Quarried in Derbyshire #urbangeology #southbancentre
June 9, 2025 at 5:35 PM
I just love the mid-century Derbydene Marble fossil walls in the Royal Festival Hall on London’s South Bank. Whopping big crinoids from the Eyam Limestone Formation. Quarried in Derbyshire #urbangeology #southbancentre
Photos from today’s walk: the columnar-jointed Late Carboniferous Port Seton-Spittal quartz dolerite dyke intruding Early Carboniferous limestones exposed at Longniddry, East Lothian.
April 6, 2025 at 9:00 PM
Photos from today’s walk: the columnar-jointed Late Carboniferous Port Seton-Spittal quartz dolerite dyke intruding Early Carboniferous limestones exposed at Longniddry, East Lothian.
January 24, 2025 at 4:19 PM
It's not uncommon to find a few late-flowering Small Scabious, Scabiosa columbaria on the NW limestones in England. And that's exactly what this is.
#wildflowerhour
#Arnside Knott
@nationaltrust.org.uk
#wildflowerhour
#Arnside Knott
@nationaltrust.org.uk
October 5, 2025 at 7:09 PM
It's not uncommon to find a few late-flowering Small Scabious, Scabiosa columbaria on the NW limestones in England. And that's exactly what this is.
#wildflowerhour
#Arnside Knott
@nationaltrust.org.uk
#wildflowerhour
#Arnside Knott
@nationaltrust.org.uk
This hare mosaic is from Corinium, ancient Cirencester. There are over 90 tessellated (mosaic) pavements from Roman Corinium. The colours come from British stones: for example limestones – greys and browns (Cotswold limestones gave greys and creams). #MosaicMonday
February 10, 2025 at 7:05 AM
This hare mosaic is from Corinium, ancient Cirencester. There are over 90 tessellated (mosaic) pavements from Roman Corinium. The colours come from British stones: for example limestones – greys and browns (Cotswold limestones gave greys and creams). #MosaicMonday
This is my definition of a paradise for structural geologists: the Tellaro Fault near La Spezia shearing the Triassic-Jurassic limestones of the Tuscan Nappe!
#geology
#structuralgeology
#faulting
⚒️
#geology
#structuralgeology
#faulting
⚒️
June 2, 2024 at 12:14 PM
This is my definition of a paradise for structural geologists: the Tellaro Fault near La Spezia shearing the Triassic-Jurassic limestones of the Tuscan Nappe!
#geology
#structuralgeology
#faulting
⚒️
#geology
#structuralgeology
#faulting
⚒️
I'm scripting my next geology video atm, about limestones. What do you think are the most important things for absolute beginner geologists to know about limestones? I'm thinking in terms of beginner stuff that is visible with the naked eye or hand lens, or big facts. #Geology #Paleontology
August 13, 2025 at 1:37 PM
I'm scripting my next geology video atm, about limestones. What do you think are the most important things for absolute beginner geologists to know about limestones? I'm thinking in terms of beginner stuff that is visible with the naked eye or hand lens, or big facts. #Geology #Paleontology
some places i been to lately
August 24, 2025 at 11:53 PM
some places i been to lately
February 22, 2025 at 3:16 PM