#Striatolamia macrota

[thelordofologies]

Fossil Shark Teeth ID Project - Part 8

I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.

These are shark teeth ID#051 - ID#060. If I misidentified anything, or if anyone has any questions or wants to be tagged in this project, please let me know:)

ID#051

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#052

Species - Scientific Name: Porbeagle shark - Lamna nasus

ID#053

Species - Scientific Name: Porbeagle shark - Lamna nasus

ID#054

Species - Scientific Name: Porbeagle shark - Lamna nasus

ID#055

Species - Scientific Name: Brachycarcharius lerichei - Brachycarcharius lerichei

ID#056

Species - Scientific Name: Brachycarcharius lerichei - Brachycarcharius lerichei

ID#057

Species - Scientific Name: Porbeagle shark - Lamna nasus

ID#058

Species - Scientific Name: Brachycarcharius lerichei - Brachycarcharius lerichei

ID#059

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

ID#060

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

Tags: @darkcybertron @cornerstars @writingraccoon

[uk-fossils]

Striatolamia macrota Shark Tooth Fossil - Paleocene, USA | Genuine + COA

Authentic Striatolamia macrota Fossil Shark Tooth – Late Paleocene, Aquia Formation

This is a genuine Striatolamia macrota fossil shark tooth, carefully sourced from the Late Paleocene (Thanetian) deposits of the Aquia Formation, Piscataway Member, at Wades Bay, Charles County, Maryland, USA. Dating back approximately 59–56 million years, this well-preserved tooth comes from an extinct species of sand tiger shark that thrived in prehistoric marine environments.

Striatolamia macrota belonged to the family Odontaspididae and was an early relative of modern sand tiger sharks. Known for their elongated, narrow teeth with sharp cusps, these sharks were likely opportunistic predators that fed on fish and other marine life.

Geology & Formation:

The Aquia Formation is a significant Paleocene-aged marine deposit found in the mid-Atlantic United States. The Piscataway Member is particularly rich in well-preserved vertebrate fossils, including numerous species of sharks, rays, and bony fish. This formation provides valuable insight into marine ecosystems following the mass extinction that ended the Cretaceous period.

Fossil Information:

Scientific Name: Striatolamia macrota

Location: Wades Bay, Charles County, Maryland, USA

Formation: Aquia Formation (Piscataway Member)

Geological Age: Late Paleocene (Thanetian) (~59–56 million years ago)

Fossil Type: Shark Tooth

Guaranteed Authenticity:

All of our fossils are 100% genuine and come with a Certificate of Authenticity. The specimen shown in the images is the exact fossil you will receive.

Size & Presentation:

Scale Rule / Cube = 1cm (see photos for accurate sizing)

Specimen dimensions provided in listing images

Natural preservation with excellent details

Perfect for:

✔ Fossil Enthusiasts & Collectors

✔ Shark Tooth Collectors

✔ Educational Use & Teaching

✔ Unique Gifts for Paleontology Lovers

✔ Museum & Display Collections

✔ Natural History Exploration

Own a rare and beautifully preserved fossil from an extinct species of sand tiger shark and a piece of prehistoric marine history today! Fast & Secure Shipping Available.

[sciencespies]

Shark teeth from millions of years ago solve mystery of Earth's ancient climate

https://sciencespies.com/environment/shark-teeth-from-millions-of-years-ago-solve-mystery-of-earths-ancient-climate/

Shark teeth from millions of years ago solve mystery of Earth's ancient climate

Tens of million years ago, sand tiger sharks hunted in the waters off the Antarctic Peninsula, gliding over a thriving marine ecosystem on the seafloor below.

All that remains of them today is their sharp pointed teeth, but those teeth tell a story.

They’re helping solve the mystery of why the Earth, some 50 million years ago, began shifting from a “greenhouse” climate that was warmer than today toward cooler “icehouse” conditions.

Many theories about this climate shift focus on Antarctica. There is geologic evidence that both the Drake Passage, which is the water between South America and the Antarctic Peninsula, and the Tasman Gateway, between Australia and East Antarctica, widened and deepened during this time as Earth’s tectonic plates moved.

(Copernicus Marine Services/European Union)

Above: A map of the ocean surface temperature as measured by satellites shows the Antarctic Circumpolar Current, marked by dark lines. Antarctica’s sea ice appears in light blue.

The wider, deeper passages would have been necessary for the waters of the major oceans to come together and the Antarctic Circumpolar Current to form. That current, which flows around Antarctica today, traps cold waters in the Southern Ocean, keeping Antarctica cold and frozen.

The now-extinct sand tiger shark species Striatolamia macrota was once a constant in the waters around the Antarctic Peninsula, and it left exquisitely preserved fossil teeth on what is now Seymour Island near the tip of the peninsula.

By studying the chemistry preserved in these shark teeth, my colleagues and I found evidence of when the Drake Passage opened, which allowed the waters of the Pacific and Atlantic oceans to mix, and what the water felt like at the time.

The temperatures recorded in shark teeth are some of the warmest for Antarctic waters and verify climate simulations with high atmospheric carbon dioxide concentrations.

Oxygen captured in very sharp teeth

Sand tiger sharks have sharp teeth that protrude from their jaw to grasp prey. A single shark has hundreds of teeth in multiple rows. Over a lifetime, it sheds thousands of teeth as new ones grow.

Important environmental information is encoded within the chemistry of each tooth and preserved there over millions of years.

Illustrations of sand tiger shark teeth used by the scientists. (Christina Spence Morgan)

For example, the outer layer of a shark’s tooth is composed of an enameloid hydroxyapatite, similar to enamel in human teeth. It contains oxygen atoms from the water the shark lived in. By analyzing the oxygen, we can determine the temperature and salinity of the surrounding water during the shark’s life.

The teeth from Seymour Island show that the Antarctic waters – at least where the sharks lived – stayed warmer longer than scientists had estimated.

Another clue comes from the element neodymium, which adsorbs and replaces other elements in the outer enameloid of the tooth during early fossilization.

Each ocean basin has a distinct ratio of two different neodymium isotopes based on the age of its rocks. Looking at the ratio in the shark teeth allows us to detect the sources of the water where the shark died.

If conditions are stable, the neodymium composition would not change. However, if neodymium composition does change in fossil teeth over time, that indicates changes in oceanography.

Big sharks, warm water

We studied 400 teeth from Seymour Island, from all ages of shark, juvenile to adult, from individuals living between 45 million to 37 million years ago. The combination of tooth size and chemistry yielded some surprising clues to the past.

Some of the teeth were extremely large, suggesting these ancient Antarctic sand tigers were larger than today’s sand tiger shark, Carcharias taurus, which can grow to about 10 feet long.

(Jlencion/Wikimedia Commons/CC BY-SA)

Above: A modern sand tiger shark, also known as a grey nurse shark, shows its rows of teeth.

In addition, water temperatures the sharks lived in were warmer than previous studies involving Antarctic clam shells suggested. It’s possible the difference was between waters closer to the surface and deeper on the sea floor, or the sharks whose teeth we found may have spent part of their lives in South America.

Today’s sand tiger sharks track warm waters. They spend summer and early fall between coastal Massachusetts and Delaware, but when waters cool off, they migrate to coastal North Carolina and Florida. Because their teeth continuously form and move forward almost like a conveyor belt, there are some teeth within the jaw that represent a different habitat than where a shark is living.

It is possible that the ancient sand tiger sharks also migrated, and when Antarctic waters cooled off, they headed north to warmer waters at lower latitudes.

The teeth suggested that the sharks’ water temperature then was similar to the water temperatures where modern sand tiger sharks can be found today. Carbon dioxide concentrations were also three to six times higher than today, so scientists would expect amplified temperatures in the regions.

Finally, the neodymium in the fossil sand tiger shark teeth provides the earliest chemical evidence of water flowing through the Drake Passage that aligns with tectonic evidence. The early timing of the Drake Passage opening, but the delayed cooling effect, indicates there are complex interactions between Earth’s systems that affect climate change.

What about their northern cousins?

Sand tiger sharks were found around the world during the Eocene, suggesting they survived in a wide range of environments. In the Arctic Ocean, for example, they lived in brackish waters that are less salty than the open ocean 53 million to 38 million years ago and were much smaller than their southern cousins off Antarctica.

Differences in the saltiness of the tiger sharks’ habitat and size of the sharks also show up in the Gulf of Mexico during this time. That range of environmental tolerance bodes well for the modern sand tiger sharks’ survival as the planet warms once again.

Unfortunately, the pace of warming today is faster and may be beyond the sand tiger shark’s ability to adapt.

Sora Kim, Assistant Professor of Paleoecology, University of California, Merced.

This article is republished from The Conversation under a Creative Commons license. Read the original article.

#Environment

[thelordofologies]

Fossil Shark Teeth ID Project - Part 5

I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.

These are shark teeth ID#021 - ID#030. If I misidentified anything, or if anyone has any questions or wants to be tagged in this project, please let me know:)

ID#021

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#022

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#023

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#024

Species - Scientific Name: Hypotodus verticalis - Hypotodus verticalis

ID#025

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#026

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#027

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#028

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#029

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#030

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

Tags: @darkcybertron @cornerstars

[thelordofologies]

Fossil Shark Teeth ID Project - Part 9

I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.

These are shark teeth ID#061 - ID#066. If I misidentified anything, or if anyone has any questions or wants to be tagged in this project, please let me know:)

ID#061

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

ID#062

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

ID#063

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

ID#064

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#065

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#066

Species - Scientific Name: Porbeagle shark - Lamna nasus

Tags: @darkcybertron @cornerstars @writingraccoon

[thelordofologies]

Fossil Shark Teeth ID Project - Part 6

I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.

These are shark teeth ID#031 - ID#040. If I misidentified anything, or if anyone has any questions or wants to be tagged in this project, please let me know:)

ID#031

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

ID#032

Species - Scientific Name: N.A. , meaning I was not able to ID the tooth's species.

Family: White sharks - Lamnidae

ID#033

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#034

Species - Scientific Name: Sand tiger shark - Carcharius taurus

ID#035

Species - Scientific Name: Sand tiger shark - Carcharius taurus

ID#036

Species - Scientific Name: Sand tiger shark - Carcharius taurus

ID#037

Species - Scientific Name: Porbeagle shark - Lamna nasus

ID#038

Species - Scientific Name: Sand tiger shark - Carcharius taurus

ID#039

Species - Scientific Name: Sand tiger shark - Carcharius taurus

ID#040

Species - Scientific Name: Sand tiger shark - Carcharius taurus

Tags: @darkcybertron @cornerstars @writingraccoon

[thelordofologies]

Fossil Shark Teeth ID Project - Part 3

I am currently working on a shark teeth ID project. It is a personal project I am working on because I got gifted a multitude of fossil shark teeth of various species.

These are the first ten shark teeth by their ID # number. If I misidentified anything, or if anyone has any questions or wants to be tagged in this project, please let me know:)

ID#001

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#002

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#003

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis

ID#004

Species - Scientific Name: Broad-Tooth Mako - Cosmopolitodus hastalis (probably, but too badly eroded to make a sure ID, at least based solely on visuals)

ID#005

Species - Scientific Name: Shortfin Mako - Isurus oxyrinchus

ID#006

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#007

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#008

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#009

Species - Scientific Name: Striatolamia macrota - Striatolamia macrota

ID#010

Species - Scientific Name: Isurus retroflexus - Isurus retroflexus

Note: I will post more parts with more IDs soon, possibly tomorrow:)

Tags: @darkcybertron @cornerstars

[uk-fossils]

Striatolamia macrota Fossil Shark Tooth - Eocene Shark Fossil | Bracklesham Beds, Hampshire UK | Genuine Specimen

Striatolamia macrota Fossil Shark Tooth

From the Bracklesham Beds Formation, Hampshire, UK (Eocene Epoch)

This exquisite fossil tooth belongs to the extinct sand shark species Striatolamia macrota, a fascinating prehistoric shark that roamed the ancient seas approximately 50 million years ago during the Eocene epoch. This species is known for its slender, finely serrated teeth, ideal for capturing slippery prey such as fish and squid.

Geological Context: The fossil comes from the Bracklesham Beds formation, famous for its abundant marine fossils, located at Alum Bay, Isle of Wight, and extending along coastal sites in Hampshire, including Bracklesham Bay. These sedimentary layers represent shallow marine conditions, preserving numerous marine fossils, particularly shark teeth, molluscs, and marine mammal bones.

Fossil Information:

Species: Striatolamia macrota (Extinct Sand Shark)

Fossil Type: Shark Tooth Fossil

Geological Period: Eocene Epoch (~50 million years old)

Geological Formation: Bracklesham Beds

Location: Alum Bay, Hampshire, United Kingdom

Discovery Date: 08 March 2025

Discoverers: Alister & Alison (our own professional fossil-hunting team)

Preparation: Expertly cleaned, carefully prepped and treated by Alison to highlight its natural beauty and ensure its preservation.

Dimensions: Scale cube in the photo measures 1cm³. (Please refer to the photo for precise dimensions.)

Authenticity & Provenance: This fossil is a carefully selected, 100% genuine specimen from the Alice Purnell Collection. Your purchase includes a full Certificate of Authenticity verifying its origin and authenticity. The photo provided shows the exact fossil you will receive.

Ideal for fossil collectors, marine life enthusiasts, or as a unique gift for those interested in natural history.

Own a genuine tooth from one of Britain's prehistoric Eocene sharks today!

[uk-fossils]

Striatolamia macrota Fossil Sand Shark Tooth – Barton Beds, Eocene – Barton-on-Sea, Hampshire, UK

Striatolamia macrota Fossil Sand Shark Tooth – Barton Beds, Eocene – Barton-on-Sea, Hampshire, UK

About the Fossil:

This remarkable Striatolamia macrota fossil shark tooth is from the Barton Beds, dating back to the Eocene epoch (~40-37 million years ago). It was discovered in Barton-on-Sea, Hampshire, UK, an area famous for its rich marine fossil deposits. Striatolamia macrota was a large predatory sand shark that thrived in the warm, shallow seas of the Eocene period.

This particular specimen was discovered by our own team members, Alister and Alison, on 08 June 2024, and has been expertly cleaned, prepped, and treated by Alison to ensure it is in prime condition for collection or display.

Striatolamia macrota was an ancestor of modern sand sharks (Odontaspididae) and is known for its elongated, pointed teeth with fine vertical striations. These teeth were perfectly adapted for grasping slippery prey such as fish and squid. Fossilized shark teeth like this one are highly prized due to their excellent preservation and sharp detail.

Geology & Formation:

Geological Age: Eocene (~40-37 million years ago)

Formation: Barton Beds

Location: Barton-on-Sea, Hampshire, UK

Preservation: Excellent detail with sharp edges and fine enamel structure

Why This Fossil?

✔ 100% Genuine Specimen – Comes with a Certificate of Authenticity

✔ Unique Discovery – Found by our team members, Alister and Alison, on 08 June 2024

✔ Expertly Prepared – Cleaned, prepped, and treated by Alison

✔ Rare & Highly Collectible – From the renowned Alice Purnell Collection

✔ Perfect for Display or Study – Ideal for fossil collectors, students, and paleontology enthusiasts

✔ Scale Cube = 1cm – See photos for full sizing

The fossil in the photo is the exact specimen you will receive!

📦 Secure Packaging & Fast Shipping – Your fossil will be carefully packed for a safe journey!

[uk-fossils]

Rare British Fossil Shark Tooth - Striatolamia macrota, Eocene London Clay, Isle of Sheppey, UK - w/ Certificate

This authentic fossil shark tooth from the extinct species Striatolamia macrota is a rare specimen from the Eocene epoch, discovered in the iconic London Clay deposits at Warden Point, Isle of Sheppey, Kent, UK. This fossil, dating back approximately 50 million years, offers a fascinating window into Britain’s ancient marine ecosystems, when large predatory sharks like Striatolamia macrota thrived in the warm, shallow seas. Each fossil in our collection is 100% genuine and comes with a Certificate of Authenticity, guaranteeing its historical and scientific significance.

The species Striatolamia macrota was a formidable predator, related to today’s sand tiger sharks. This tooth shows the characteristic long, slender shape and serrated edges that would have been used to capture and consume prey. Fossils like this reveal important insights into the diversity and adaptation of ancient sharks, making it an exciting addition for collectors and enthusiasts alike.

Species: Striatolamia macrota (extinct shark)

Origin: Warden Point, Isle of Sheppey, Kent, UK

Geological Formation: London Clay, Eocene Epoch (~50 million years ago)

Authenticity: 100% genuine, with a Certificate of Authenticity provided

Condition: Excellent preservation with distinct serrations and anatomical features

Scale and Sizing: Scale cube in photos represents 1cm; please refer to images for full size details

Specimen Specificity: The photo shows the exact specimen you will receive

This tooth has been selected for its high quality and historical relevance. It’s an ideal addition to any fossil collection, educational display, or personal collection for those fascinated by prehistoric marine life. Don’t miss this opportunity to own a real piece of Earth’s ancient past, connecting you to the intriguing world of Eocene-era sharks!

[uk-fossils]

Rare British Fossil Shark Tooth - Striatolamia macrota, Eocene London Clay, Isle of Sheppey, UK - w/ Certificate

This authentic fossil shark tooth from the extinct species Striatolamia macrota is a rare specimen from the Eocene epoch, discovered in the iconic London Clay deposits at Warden Point, Isle of Sheppey, Kent, UK. This fossil, dating back approximately 50 million years, offers a fascinating window into Britain’s ancient marine ecosystems, when large predatory sharks like Striatolamia macrota thrived in the warm, shallow seas. Each fossil in our collection is 100% genuine and comes with a Certificate of Authenticity, guaranteeing its historical and scientific significance.

The species Striatolamia macrota was a formidable predator, related to today’s sand tiger sharks. This tooth shows the characteristic long, slender shape and serrated edges that would have been used to capture and consume prey. Fossils like this reveal important insights into the diversity and adaptation of ancient sharks, making it an exciting addition for collectors and enthusiasts alike.

Species: Striatolamia macrota (extinct shark)

Origin: Warden Point, Isle of Sheppey, Kent, UK

Geological Formation: London Clay, Eocene Epoch (~50 million years ago)

Authenticity: 100% genuine, with a Certificate of Authenticity provided

Condition: Excellent preservation with distinct serrations and anatomical features

Scale and Sizing: Scale cube in photos represents 1cm; please refer to images for full size details

Specimen Specificity: The photo shows the exact specimen you will receive

This tooth has been selected for its high quality and historical relevance. It’s an ideal addition to any fossil collection, educational display, or personal collection for those fascinated by prehistoric marine life. Don’t miss this opportunity to own a real piece of Earth’s ancient past, connecting you to the intriguing world of Eocene-era sharks!