These granite pegmatites can include metre-scale crystals and make statement wall cladding & counter tops. They’re texturally variable so precise provenance is difficult, but they’re from E Brazil, typically associated with the Aracuai orogen. They’re mined for gems & REEs too #urbangeology
茨城県三の丸庁舎エントランスの壁は国産大理石の錦紋黄🇯🇵ウミユリの化石がちらほらと見つかりました。
#街の中で見つかるすごい石
#UrbanGeology
#金曜日だから化石貼る
#FossilFriday
A postcard format poster for the walk, showing a photo of the Guildhall Art Gallery and a photomontage with an ammonite fossil and some pink granite and the text ‘Geology and building stones in the city of London. Meet at 2.30 pm at Bank Station Exit 1’
My next #urbangeology walk with London Walks will be on 2 May 2026 and will be all about the rocks, minerals and fossils in building stones in the City of London. Reservations and more info is at www.walks.com/our-walks/ge...
See you there!
Brown paving slab with a section through the spiral shell of an ammonite
A fossil belemnite with the phragmacone preserved in a paving slab. This is a dark brown, cigar shaped fossil with a cone-shaped, flared structure in which the individual chambers of the shell can be seen. It’s rare for this phragmacone to be preserved.
A nice walk this afternoon looking at urban and bedrock geology in Walthamstow with a team of TfL engineers. We started of with a bit of Jurassic pavement palaeontology #urbangeology
#Urbangeology! Where?
Some nice examples of #UrbanGeology. Who helps out on the lightgreen mineral in the gabbro? Olivine is next to it, the outer rim shows the mineral is not stable in this gabbro... #geology ⚒️ #rocks #geo #orthoceras #gastropods #conglomerate
遅刻。桜木町駅前のピオシティ地下にある喫茶店「花壇」の店舗外壁はには山口県産大理石の白鷹🇯🇵が使われていました！でもポスターや看板で隠されてしまっています‥‥。サンゴやウミユリの化石を発見！
#街の中で見つかるすごい石
#UrbanGeology
#金曜日だから化石貼る 土曜だけどな
#FossilFriday
なんかありました。スケール入れ忘れたけど3-4cmくらいだったかな。
魚のヒレ？
#街の中で見つかるすごい石
#UrbanGeology
After running some solo errands in Potsdam I sat down to enjoy glass of wine in the evening sun… and spotted this wonderful Muschelkalk (German Trias) ooid limestone piece in (!) the pavement 🙂
#UrbanGeology ⚒️☀️🍷
The monument is carved from red sandstone in the Mughal architectural style. It is a pillar with lotus bud finial. The upper section is tetragonal with vertical blank cartouches. The lower section is a column with a central floral motif. There is a plinth of red sandstone and this rests on a very eroded plinth of (English) yellow sandstone.
The memorial of the lawyer Daboda Dewajee in Kensal Green Cemetery. It is carved from a block of red Bhander Sandstone, probably from the Dholpur region of Rajasthan. This sandstone from the Vindhyan Basin is a Global Heritage Stone and this is a remarkable use of it here in London #urbangeology
The public toilet block on Maida Hill Market with cladding of red and grey reclaimed granite with different surface finishes.
Axe dressed red rapakivi granite and grey larvikite
Two slabs of larvikite. On the left the stone has a smooth surface but has not been polished. On the right the larvikite is by polished and a dark grey blue colour.
Axe dressed red granite on the left and grey larvikite on the right
Public toilets at Maida Hill Market are clad in reclaimed and reused igneous plutonic rocks; red rapakivi granite from Finland and Norwegian larvikite. You can still see the plug marks on several blocks showing the quarrying technique. Cities need public loos! #urbangeology #reuse #reclaim #london
関内にある横浜国際ビルの壁にでっかいウニの化石を発見！有孔虫もたくさん詰まってます。
石材はイタリア産のキャンポポルフィリコ🇮🇹
#街の中で見つかるすごい石
#UrbanGeology
#金曜日だから化石貼る
#FossilFriday
横浜市山手町の坂の上にあるベーリック・ホール。マントルピースのひとつに国産大理石の霞🇯🇵が使われていました。四射サンゴと海綿の化石を発見！
#街の中で見つかるすごい石
#UrbanGeology
#urbangeology, what #fossils are these? ⚒️ #paleo #paleontology? In limestones containing large bentic foraminifers as well.
住友生命茅場町ビルの壁はネリネアを中心に巻貝の化石でいっぱい。大理石名はイタリア産のフィレットロッソ🇮🇹
#街の中で見つかるすごい石
#UrbanGeology
#金曜日だから化石貼る
#FossilFriday
In Alicante (Spain), there is a long avenue full of fossils of different age (red tiles: ~160 Mya, black tails: ~100 Mya, white tailes: ~50 Mya) #urbangeology
bsky.app/profile/jgpa...
A fossil favosites coral pebble with a distinctive honeycomb surface occurs amongst smaller flint pebbles in an orange-brown coloured, iron oxide rich sandy gravel.
Here in the UK, the Faringdon Sponge Gravels (Aptian, Cretaceous) are used for making hoggin paths. They contain abundant fossils, often derived from older strata. Here a fossil Favosites coral peeps through the hoggin path in Gordon Square Gardens in Bloomsbury #urbangeology #london
気になったので見てきました。巻貝の化石？が含まれています。トルコ産のエンペラドールロイヤルクロム🇹🇷かな？
#街の中で見つかるすごい石
#UrbanGeology
津田沼駅前の十三ビルで小さなアンモナイトとベレムナイトを発見！スペイン産のロッソアリカンテ🇪🇸
#街の中で見つかるすごい石
#UrbanGeology
#金曜日だから化石貼る
#FossilFriday
A tweet of mine with a photo of some weird patterns on the pavement- are they corals?
Example of same patterns in Narodni Museum with the label "Section through stony coral"
Today I found the answer to a long-unsolved mystery.🥳
📌 Narodni Museum, Prague.
#urbangeology
Uh-oh, I forgot to share this. Hello little nerineid on the stairs of Residenzschloss Dresden.😁
#urbangeology
An ammonite section on a yellow floor
Similar
Similar
Similar
Hello little ammonites on the floor of Army Museum Žižkov of Prague!
#urbangeology
(Er, of course I will post photos from the normal, intended display of the museum too, later😅)
Cibber’s panel on the monument. At the bottom left London personified sits slumped on rubble whilst the fire rages above her. On the left King Charles II orders her resurrection and above him, men are working on scaffold rebuilding the city
A view of The Monument to the Great Fire of London on a stunningly beautiful spring day
A fabulous day for an #urbangeology walk yesterday. We started at my favourite piece of public sculpture, the panel on the plinth of The Monument, carved in the 1670s by Caius Gabriel Cibber in #PortlandStone. Thanks to everyone who came along! Book onto future walks at www.walks.com/guides/ruth-1/
An ammonite on the pavement
Another
Hello little ammonites on Dresden's altmarkt-galerie😍
#urbangeology
