Bluesky · Hashtag

#FossilFriday

322
posts · 30d
146
users
11
posts / day
2.2
posts / user
+ 15% vs last week

#FossilFriday is an active hashtag on Bluesky. In the last 30 days, 146 people shared 322 posts with it — around 11 a day. Activity is up 15% versus the previous week, peaking on Sep 18 with 83 posts.

#FossilFriday posts per day (last 30 days)

Posts with #FossilFriday

David Clark
@clarkeocrinus.bsky.social
about 1 year ago
This is one of the most stunning crinoids in my collection. Gennaeocrinus mourantae from the Devonian Arkona Fm. of Ontario. A large pocket of these were found decades ago and very few have been found since. #FossilFriday
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91 278 3471
Charmouth Heritage Coast Centre
@charmouthhcc.bsky.social
3 months ago
It's another stunning 2026 find for July's Fossil of the Month! Tony Gill found this rock showing a hint of ammonite back in January. Some expert prep work from Kayleigh Gill has revealed this stunning, rare ammonite, an ancestor to the ones found up in Yorkshire! #FossilFriday
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39 296 2443
Cam Muskelly (Explorer of Deep Time ⏰ ⚒️)
@cambriancam.bsky.social
7 months ago
Happy #FossilFriday This is a beautiful Hexagonaria (colonial horn coral) from the Middle Devonian Cedar Valley Formation from Coralville, Iowa. There is a location in Iowa City, Iowa known as the Devonian Fossil Gorge where you can see an intact coral 390 million year old coral reef like this one.
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69 263 2180
Cam Muskelly (Explorer of Deep Time ⏰ ⚒️)
@cambriancam.bsky.social
10 months ago
Welcome back to #FossilFriday! Here is a Petoskey Stone which is Michigan's state stone. It is a colonial rugose coral known as Hexagonaria percarinata. This comes from the Middle Devonian (Givitian) Gravel Point Formation (Traverse Group). Each corallite that you see would have housed a polyp.
51 221 1930
Cam Muskelly (Explorer of Deep Time ⏰ ⚒️)
@cambriancam.bsky.social
8 months ago
Welcome back to another #FossilFriday Here is the molar from an American Mastodon (Mammut americanum). This comes from Pleistocene deposits in San Jacinto County, Texas. Mastodons used their bumpy molars for grinding up twigs, leaf matter, and other shrubs.
63 220 1835
Cam Muskelly (Explorer of Deep Time ⏰ ⚒️)
@cambriancam.bsky.social
7 months ago
Welcome back to #FossilFriday everyone! Here we have a beautiful chain coral known as Halysites cantenularia. This comes from the Lower Silurian Cordell Formation (Monistique Group) Door County, Wisconsin.
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30 155 1572
Cam Muskelly (Explorer of Deep Time ⏰ ⚒️)
@cambriancam.bsky.social
8 months ago
#FossilFriday Here is a gorgeous piece of petrified wood belonging to the genus Schinoxylon. This comes from the Eocene aged Laney Shale Member of the Green River Formation from in Valley, Sweetwater Co, Wyoming. This specimen has a beautiful vein of blue Chalcedony Quartz running through it.
35 158 1544
Cam Muskelly (Explorer of Deep Time ⏰ ⚒️)
@cambriancam.bsky.social
9 months ago
Welcome to the first #FossilFriday of 2026! We kick off the new year with this beautiful colonial horn coral know as Acrocyathus floriformus. This specimen comes from the Middle Mississippian (Lower Carboniferous) St. Louis Limestone in Missouri.
36 108 1380
David Clark
@clarkeocrinus.bsky.social
5 months ago
This is a Mississippian aged crinoid, Taxocrinus, from the Indian Shale Fm. of Indiana. I've collected this site a few times and found lots of blastoids. Crinoids are much less common. #FossilFriday
62 150 1351
Mark Witton
@markwitton.bsky.social
4 days ago
New #paleoart for #FossilFriday: Baryonyx walkeri portrait factoring new epidermal correlate data gathered for an ongoing project. "Yes" to lips, "no" to a cornified sheath on the nasal crest, "yes" to a boss and scale above the eyes. More details at my Patreon: www.patreon.com/markwitton
Portrait of a long-snouted predatory dinosaur in the dimming evening light. Reddish skin gives way to a paler underside on the neck and face, while conifer trees - skeletonised and in full leaf - are silhouetted against a purply-yellow-blue skyscape.
5 56 174

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