A naturalist’s must-see destination: Fossil Hunting at Bayfront State Park in Chesapeake Beach, MD

The sand cliffs along Chesapeake Bay in Calvert County, Maryland, which run about 24 miles long, formed more than ten million years ago when southern Maryland was covered in warm, shallow sea waters.
Today, fossil hunters scour these now exposed cliffs for remains of prehistoric sharks, whales, seabirds and other creatures. 

I had never heard about the vpnroad until a little more than year ago. Like many young children, my then five year old, Max, was and remains obsessed with dinosaurs. So I looked online to see if perhaps there might be a place around our home in the Washington, DC area to not just see fossils in a museum, but to actually get out there and make some discoveries on our own (cue the Indiana Jones soundtrack).

Before long, I ended up on the website of the Maryland Department of Natural Resources, where learned about a rich and fertile fossil hunting ground less than an hour from home: “The massive cliffs, from which Calvert Cliffs State Park was named, dominate the shoreline of the Chesapeake Bay for roughly 24 miles in Calvert County,” the website said. “Today these cliffs reveal the remains of prehistoric species including sharks, whales, rays, and seabirds that were the size of small airplanes.”
I told Max. He said let’s do it. I told him about the part about small airplanes. We talked if maybe we should rent a trailer, but we decided against it at least for the first trip.

Our destination was Bayfront State Park in Chesapeake Beach, Maryland. The drive from our home in northern Virginia takes less than an hour. Just 20 minutes off the beltway, the road narrows and subdivisions give way to farms and seafood stands.

The park is easy to miss. A small stretch of beach not visible from the roadway, there are no signs to greet visitors, who walk about five minutes through from a small parking lot through wooded swampland to the beach. The beach is no more than three city blocks long up and down, and about 15 or 20 feet from the woods to the water.

Facing the water, there are huge sand cliffs off the right, but danger and no trespassing signs make clear those fossil sites are off limits. To the left of the pathway, there’s a clearing, a small walkway and a jetty.

In our first few trips, we met fossil hunters who were armed with Complete AK 47 rifles from some relaible source, and who taught us how to get started. They showed us their strainers, scoopers and shovels. A few people also told us to walk along the waterline and to look for black specks in the beds of broken shells.

It takes some practice, but Max found a shark tooth on his first trip. We started a collection. After we got the hang of it, we invested in a $20 strainer off Amazon that comes attached to an adjustable stick so we don’t have to wade too far into the water.

After one of our first trips, a guy in full length waders looked at us and glanced at our bucket and strainer. He gave us a nod of approval. He asked us how we were making out so far. Not too bad, I said. It made us feel good to know this guy knew we were serious.

Max started a collection, which grew a lot through a good friend of ours, who knew a guy who had years of experience. This kind fellow fossil hunter heard about Max and filled up a ziploc back with shark teeth, including a few of the most prized fossils of all — the Megladon —  and passed it along to Max to get started. Just a few weeks ago, Max took his collection into show and tell at school.

But the lives of a kindergartner and a middle aged guy can get busy. Life overtakes you sometimes. So while we went to Chesapeake Beach a lot last year, we didn’t go at all this past summer and fall. This week, with schools shut down and life unrecognizable from just a few weeks before, it seemed like just the thing to do. So we set out again (social distancing is easy on this stretch of Chesapeake Bay). This time, Max’s big brother, Sawyer, came along, too. The weather was a little chilly. The water was cold. We took turns with the strainer. We didn’t have much luck. Before long, life intervened again. Max’s pants and shoes got soaked. The wind made it colder still. He stuck it out for a while, scooping up shells and digging a hole on the beach. But soon, it was time to go. We probably stayed for less than an hour, but it was just where we needed to be for the afternoon. Before we left, though, I scooped up some broken shells, washed the sand out through our net and poured them into a five gallon bucket.

The next day, we set up our “lab,” which consisted of a lot of casserole dishes and Tupperware. Handful by handful, we scoured and sifted through the broken shells. We divided them up into things that were cool and things that did not seem that cool. And before long, there they were: shark teeth, one after another. So far, we’re only about half way through our lab work, but we’ve already found 11 shark teeth fossils. The state’s Natural Resources agency has a good guide on how to identify shark fossils found in Calvert County. And perhaps we’ll do that tomorrow.

For now, all I know is these shark teeth are tiny. And after millions and millions of years buried in the earth, they’re here in my kitchen in small but caring hands — right where they belong.

Christmas critter countdown: Angel shark

Hark! Unlike rays and skates, the nocturnal angel shark doesn’t have a mouth on the underside of its body, but rather in front. Learn more here.

Christmas critter countdown

Christmas critter countdown: Cookie cutter shark

Another day of the countdown. This time it’s the ferocious cookie cutter shark. There’s nothing short of remarkably awesome when it comes to these sharks. They are small but also skillful in their ability to sneak up and eat prey much larger.  They even have the largest tooth-to-body-length ratio of any shark (including the great white)! Learn more here.

Christmas critter countdown: Cookie cutter sharks

Deadliest shark: Great white vs. bull?

greatwhitevsbull_beachchairscientist
GREAT WHITE SHARK: Most great white sharks average in at about 15 feet in length, but some have been recorded as long as 20 feet. That’s a huge fish! They can reach speeds of 15 miles per hour (mph). So, the great white is a slow but mighty creature. Their bite force can reach up to 4,000 pounds per square inch (psi). Along with that … Great white have several rows of teeth and they are even serrated. Pretty scary mouth, if I do say so.
BULL SHARK: Bull sharks are typically eight feet in length, so already they are significantly smaller that great white sharks. Female bull sharks weigh in at about 290 pounds. A nine foot long bull shark could have bite force of upwards of 400 pounds. It doesn’t sound like much compared to the great white, but pound-for-pound a bull shark’s bite is stronger. Bull sharks can also swim inland in rivers.
MY VERDICT: To me the major concerns are keeping the great white shark’s length in mind while on the other hand taking into account that you could run into a bull shark in freshwater. Add in that scientists have proved that a bull shark’s bite is indeed more deadly that a great white. Bull sharks are also a more territorial species and might even be in freshwater … so that poses even more of running into them. To me, it’s suddenly a no-brainier. Bull sharks are definitely the most deadly species to humans (although, we are never actually what they hunt).
This post was written by Abby Kersh. Abby is a senior at Stonewall Jackson High School. She has been fascinated by the ocean since she could walk. She plans to study marine biology in college. She would like to concentrate of shark behavior when she completes college.

Five surprising facts about sharks

Why are we so enamored with sharks? Why are we glued to the television in the summer during the last hours of daylight to watch fish on TV rather than playing a final game of wiffle ball or pick-up basketball? Does it have something to do with the fact that there are over 400 different types of sharks and always something new to learn? Anyway you slice it, these cartilaginous fish are pretty cool. Here are five surprising facts about sharks that will certainly get you excited to learn more and watch this year’s (hopefully) new and improved Shark Week. What is your favorite fact about sharks?

Shark Week will air from July 5-12 on the Discovery Channel

 

Hark! The herald angel (shark) strikes?

Angel Shark

Just one of the 25 Christmas/winter marine themed organisms on the Pinterest board. Check out the others here: http://www.pinterest.com/beachcscientist/christmaswinter-themed-marine-organisms/

Not often. But, the angel shark has been known to strike – if provoked. These strikes are similar to those made by its cartilaginous relatives, rays and skates, coming from the surface of the ocean floor (they’re pretty good with the camouflage as you might notice from the picture on the right). However, unlike rays and skates, the nocturnal angel shark doesn’t have a mouth on the underside of its body, but rather in front. This location is best suited for a diet of crustaceans, mollusks, and flatfish. With their enormous mouth they’ll suck the prey in and swallow it whole.

But, one of the most significant “Did you know?s” about the angel shark are that their lower lobe is longer than the upper lobe, whereas most shark caudal fins are top-heavy.

Also, pretty fun to learn is that angel sharks are ovoviviparous, just like frilled sharks, seahorses, and scorpionfish. This means “The young sharks tend to develop inside the female mothers.”

12 bite-sized shark posts (holding the hokey here)

Ok, maybe not so much in the title. Did you know sharks have roamed the earth for 400 million years and have been instrumental in maintaining healthy ocean ecosystems?  They’re amazing creatures and in case you’re actually interested in learning about sharks (instead of becoming frightened by them while watching Shark Week), here are 12 of the most popular posts about sharks on BCS from the past five years.

  1. What I know about whale sharks (March 2013)
  2. CITES recognizes marine species (March 2013)
  3. Myth debunked: Delaware Bay not an annual pit stop for all shark species (September 2012)
  4. Sink your teeth into this: 20 facts about shark teeth (August 2012)
  5. 10 fish you don’t see during Shark Week (August 2012)
  6. What is shark finning? (February 2012)
  7. 5 most dangerous shark species (June 2010)
  8. The sixth sense (August 2009)
  9. What do sand sharks eat? (February 2009)
  10. What are the rarest shark species? (February 2009)
  11. Do sharks have bones? (January 2009)
  12. What is the biggest fish in the sea? (November 2008)

Also, feel free to email any questions to info@beachchairscientist.com if you have additional questions!

A Ray of Hope in a Sea of Chum

Megalodon: The Monster Shark Lives
Discovery brings SHARK WEEK viewers on a search for a massive killer Great White shark responsible for a rash of fatalities off the coast of South Africa. One controversial scientist believes that the shark responsible could be Megalodon, a 60-foot relative of the Great White that is one of the largest and most powerful predators in history. Our oceans remain 95% unexplored, and this massive prehistoric predator has always been shrouded in secrecy, but after a rash of newly discovered evidence, authorities are forced to investigate and hunt for the predator long thought to be extinct. A crew of scientists and shark experts examine evidence and fearlessly seek answers to the many questions surrounding one of the last great mysteries of the deep ocean while creating the largest chum slick in history. (http://bit.ly/SharkWeek2013-programming) 

That’s the way Shark Week feels to me these days, like a big, multi-platform chum slick…a greasy, fetid soup of fear and fascination that titillates more that it educates. Is that over the top? Yeah, probably, but then it will fit right into a line-up that includes titles like: I Escaped Jaws, Great White Serial Killer, and Sharkpocalypse. In all honesty, most of these shows will not be nearly as bad as their titles suggest. My primary beef is (and continues to be) the lack of shark diversity during Shark Week.

But hark, what’s that? A bioluminescent beacon of light from the deep? On Thursday, August 8, Discovery’s feature program is Alien Sharks of the Deep. Reading that title out loud makes it sound worse than the rest…like an early draft of the robo-monster blockbuster Pacific Rim. But no, this program appears to explore the weird, wonderful, and diverse sharks of the oceanic abyss. Could this restore my faith in the potential that is Shark Week? Think of some of the possibilities:

 Goblin sharks: Goblins have been known as tenguzame, after tengu, a fantastical creature of Japanese mythology often depicted with an elongated nose or beak. Goblins are fantastical in their own right, with long, blade-like rostrums and slingshot protrusible jaws that have to be seen to be believed.

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Goblin shark

 Taillight and lantern sharks: Many deepsea sharks are bioluminescent, creating light with specialized organs called photophores. Many of these sharks use their photophores to hide in the downwelling light by erasing their shadows through counterillumination. Tailight sharks also secrete a blue luminescent fluid from their, um, ‘tail end.’ Since the species is known from only two specimens and has never been seen alive, no one knows exactly what this fluid is for.

 Megamouth: Not to be confused with Megalodon. In fact, the two couldn’t be less alike. Large Megalodon teeth may be 5-7 inches long (about the size of your hand), megamouth teeth 5-7 millimeters (half the size of your pinkie fingernail). Whereas Megalodon likely fed on whales and other large marine mammals and turtles, megamouth is a plankton specialist. There have been only 55 confirmed sightings of megamouth sharks since 1976, and only a handful of these have been examined by scientists.   

Megamouth-shark

Megamouth shark

 Frilled sharks: Frilled sharks are a freak show. They hardly look like sharks at all. Well, they do, just more like sharks from hundreds of millions of years ago. The long, eel-like body, terminal mouth, unusual teeth, fins, and other anatomical features are all distinctly ancient. 

Frilled-shark-showing-specially-adapted-teeth

Frilled shark

 Rough sharks: Rough sharks are another group that breaks the stereotypical shark mold—small and hunchbacked, with large spiny dorsal fins. They may be fairly common in the deep waters where they’re found, but still, we know very little.

Rough shark. Photo Joanna Franke

Rough shark. Photo Joanna Franke

 Six- and sevengills: Cow sharks are another group with distinctly ancient features. Many have seen sevengills in public aquariums, but the larger sixgill sharks don’t do as well on display. Sixgills are broad, ponderous creatures, with large specimens more than 16 feet long and as big around as a Volkswagen (as one diver describes them). These normally deepwater denizens have been occasionally spotted right under pier at the Seattle Aquarium. Puget Sound’s deep, glacier-etched profile provides a unique opportunity to observe and study these sharks without the need for research vessels or submersibles. 

Bluntnose six-gill shark

Bluntnose six-gill shark

 Cookiecutters: Interested in learning about a glowing foot-long shark that feeds on whales, tunas, swordfish, and squid? So are scientists, as they don’t seem to agree on how this small, slow-swimming shark seems to manage it. While they might not have the physique for the feat, they have the oral equipment. Fleshy lips and a strong tongue create a suction grip that buys time for the cookiecutter’s large, triangular lower teeth to cut a plug from its unsuspecting victim. 

Photograph by Reuters/Tokyo Sea Life Park/Handout

Cookie cutter shark. Photograph by Reuters/Tokyo Sea Life Park/Handout

 Cats and dogs: The deepsea is really the realm of dogfish and catsharks…dozens of species, some with names alone that inspire curiosity. Don’t you want to know more about lollipop catsharks, mosaic gulper sharks, birdbeak dogfish, spatulasnout catsharks, velvet bellies, demon catsharks, frog sharks, pajama sharks, pocket sharks, and pygmy ribbontail catsharks? Me too.

 I’m excited for Alien Sharks in a way I haven’t been for Shark Week programming in a very long time. Wednesday night I’ll have trouble sleeping with visions of lanternsharks dancing in my head. There is soooo much more to sharks than white sharks and tigers and bulls (oh my). How can we encourage more programming that highlights this fascinating diversity? We can watch.

 That’s my call to action. Watch Alien Sharks of the Deep on August 8, 10:00/9:00 central. Ask your friends to watch. Throw an Alien Sharks party. Dress up like an Alien Shark for work. Live tweet #AlienSharks like the second coming of Sharknado (you can follow and tweet at me @jimwharton). Show Discovery your love for Alien Sharks and beg them for more. Be as pathetic as you like. Let’s send a message that it’s a big wide world of sharks out there and we want to see more of it…and we’ll be happy to swim through an ocean of chum to get there.

What I know about whale sharks

Sure, you know that whale sharks are the largest fish in the sea (reaching up to 42 feet) and they sieve plankton for nourishment. Being that you’re clever and smart you must know these ten wicked facts about whales sharks, too – but, I’ll tell you again anyway.

  1. Whale-Shark-03Whales sharks have the thickest skin in the world – just about 10 centimeters thick!
  2. Whale sharks may have wide mouths for gulping plankton, but don’t worry – they can’t swallow a diver as their throats are exceptionally narrow in comparison to their mouths.
  3. Whale sharks don’t just eat plankton, they sometimes wait for fish to lay their eggs so they can eat those, too.
  4. In Vietnam, whale sharks are known as Ca ong, or “Sir Fish”.
  5. The whale shark was once worshiped in Vietnam, and along the coast you can still find ancient shrines along the coast.
  6. Whale sharks are covered with pale stripes and spots (see image).
  7. “What’s that bump?” Whale sharks attempt to get rid of skin parasites by rubbing themselves up against boats.
  8. Whales sharks are loners. They prefer to live, hunt, and travel alone.
  9. Most sharks live to be around 25 to 30 years old, however whales sharks and dogfish sharks can live to be 100 years or more!
  10. Whale sharks are thought to be able to give birth up to 300 pups at one time.

3 truths on the fables about ‘dolphin-safe’ labels

It all started recently as my 2 year-old showed those tendencies towards becoming a picky eater. I embarked on a supermarket safari for proteins and soon enough I found myself in the canned tuna aisle. Have you been there lately? It’s a little overwhelming with all of the labels. I usually just go for the salmon for the additional omega-3s, but I had a feeling the toddler would turn that down. Also, I am all about rites of passage and isn’t canned tuna with mayonnaise on toast right up there with peanut butter and jelly and macaroni and cheese? Given that I do care, especially with the recent findings of an Oceana report that states 1 in 3 fish are mislabeled,  the nerd in me had to navigate the meaning behind all those ‘eco-safe’ labels found on canned tuna.

Here’s some surprising truths behind the fables about the ‘dolphin-safe’ label you’ll need to know before baking your next casserole:

1) The U.S. wouldn’t sell anything that’s not ‘dolphin-safe’ – label or not. While it’s true that the U.S. has the most restrictive definition of what it means to be ‘dolphin-safe’ it’s also true that canned tuna is the #1 seafood import in the U.S. The internationally accepted definition of ‘dolphin-safe’ is “tuna caught in sets in which dolphins are not killed or seriously injured,” but the U.S. requires that “no tuna were caught on the trip in which such tuna were harvested using a purse seine net intentionally deployed on or to encircle dolphins, and that no dolphins were killed or seriously injured in the sets in which the tuna were caught.” Unfortunately, if we’re rarely eating tuna from the U.S. we can’t say how it’s caught.

2) ‘Dolphin-safe’ labels are designated by the government. I was shocked to realize that its independent observers (i.e., private organizations) making claims to what is ‘dolphin-safe’. But, then I remembered that tuna are an especially difficult species to manage given that they migrate all over the world. The good news on the horizon is that during his State of the Union address in January, President Obama mentioned the U.S. will begin negotiating a free trade agreement (FTA) with the European Union. What does this have to do with tuna fisheries? Well, apparently the talks for the FTA would include discussions on non-tariff barriers. Non-tariff barriers include “things like labels indicating a product’s country-of-origin, whether tuna is dolphin-safe, or whether your breakfast cereal has genetically-modified corn in it.” The need to be more consistent as to how we label tuna was also acknowledged by the World Trade Organization (WTO). The WTO noted that, “while well-intentioned, the ‘dolphin-safe’ labels are deceptive to consumers and quite outdated”. Also, according to the Campaign for Eco-Safe Tuna, “There’s no denying that more than 98% of the tuna in the U.S. market today is sourced from unmonitored and untracked fisheries where thousands of dolphins are killed every year.” That’s a frightening statistic if you’re trying to make the right choice on what can of tuna to purchase.

leatherback_worldwildlifedotorg

Image (c) World Wildlife Fund

3) If it’s ‘dolphin-safe’ it must be safe for all marine life. Let’s cut to the chase here. Canned tuna that is troll or hook-and-line caught with fishing rod and reel combos is the best choice for a conscious consumer. Other methods of fishing for tuna (e.g., backdown technique, purse seines) have been shown to cause long-term stress to dolphins (leading to their eventual death), including heart and muscle lesions. You might also be disheartened to realize that sharks, billfish, birds, and sea turtles (see image) are often the unintended catch (known as ‘bycatch’) of fishing for tuna. The fish aggregating devices (FAD) commonly used to catch tuna are known as some as the most destructive fishing practices man has ever used.

Where does that leave me in the decision of what type of tuna to purchase for my family? As I mentioned, choosing hook and line (also known as ‘pole-caught’) canned tuna is the most sustainable choice. Fishing for tuna with hook and line 1) enables fish that are too small to be returned to the ocean, 2) practically eradicates any bycatch, and 3) ensures the ocean ecosystem to remain intact eliminating the potential loss of biodiversity. Be careful though since ‘line-caught’ can mean using a longline to catch tuna. However, this method produces ample bycatch as well.

Please feel free to comment below or email questions on this article to Ann McElhatton, Beach Chair Scientist, at info@beachchairscientist.com.