Thursday, 18 September 2014

Back to tracks

This is in fact the first iguanodontoid track I have discovered in Pula (above). My interpretation on the right (the red outline). Note the size compared to my big feet (# 46). It is Late Albian - Mid-Cretceous (about 100 mya). The same rock surface is dinoturbated mostly by large iguanodontoids and sauropods. Also, it is weathered, due to the vicinity of the open sea.

A bit smaller "Iggy" track I have discovered about a kilometre further down the beach (resort in Pula)

  A nice manus pes set track of a large pterosaur I have found on the same beach as the Iggy in the top photograph. There are three pterosaur trackways on that spot.

 A dinoturbated rock. Probably by the ankylosaurs whose trackways I have found near by. (Pula - Late Albian)


A small titanosaur left pes track. It was probably a subadult. The outcrop is heavily dinoturbated by the very large sauropods, theropods and ornithopods. Late Albian of Pula.



Sunday, 14 September 2014

Pula and Brijuni

The view to the Porer lighthouse from the Verudela resort (Pula 9/2014)


 Tough roots making their way through the limestone.

 The recent sea gull trackway in cement from the Stoja camp (Pula)

The most photographed theropod footprint from the Pogledalo site of the Main Brijun island.


The next theropod footprint in a sequence (it comes after the one the photograph above) of the trackway from the Main Brijun island is the deeper one. The shallow one just bellow it in the photograph was made by another theropod of the same size (or the same one?) a bit later when the mud was a bit dryer. So, these are two parallel trackways. below in the left corner there is a poorly preserved impression of another theropod in the deep wet mud.


A probable small ornithopod (iguanodontoid?) track from the Main Brijun island (the Pogledalo Barremian site).




Thursday, 28 August 2014

Finding new tracks on the Main Brijun island

Although, the tracksites on the Main Brijun island have been described in the papers (the Pogledalo promontory site at least three times), I keep finding the new footprints there each time I visit it. There are two reasons why I manage doing that: the first is that some of the tracks are being constantly covered and uncovered by the beach pebbles, when the waves move them and the other is that some of the tracks are literally invisible until some particular kind of sun light reveals them.
Here is one of the large theropod foot impressions that is somewhat deformed. The red outline is my interpretation. The theropod's footprint is about 42 cm long.
This is an Early Cretaceous (Barremian). About 125 million years ago.


Several smaller theropod footprints from the same site in  various states of preservation. I have interpreted some of them with the red outline.








Monday, 25 August 2014

On Istrian tracks again

The footprint of a medium-sized theropod from the Grakalovac (Kamenjak/Premantura) site.



I keep finding new tracks after the heavy rains at the Ankylosaur dinoturbation site (I) in Pula. This left pes impression is about 40 cm long (+- 2 cm). my interpretation is the red outline below, of course. Obviously it belongs to the smaller specimen on the site. "Smaller" means that the dinosaur was probably about 8-9 meters long. That is huge for an ankylosaur! Now you can calculate yourself how big was the trackmaker anky who left the footprints some 70-75 cm long there!


The outcrop.



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Two consecutive cervical vertebrae of the Istrian pygmy titanosauriform sauropod (Early Cretaceous -Barremian). Only a small portion of the anterior one is preserved. The fossil before preparation. The photograph from the museum/gallery Ulika in Bale. — kraj: Bale-Valle Istra





Thursday, 21 August 2014

Comparing the tracks of the living animals with the fossil ones

The dog owners walked their dogs on a leash over this ground in an irregular time sequences, one or two at the time. This case illustrates the consequentially of drawing some behavioural conclusions exclusively based on the fossil trackways. Since the tracks in this image are directional (from left to the right and in the opposite direction) and are of the same morphotype (although, they were left by the dogs of the various breed), if these were say, the fossil tracks of some dinosaurs, an enthusiastic paleontologist might jump to a conclusion these were left at the same time by the herd of  animals of various growth stages. Thus implying a gregarious behaviour and even care for their young. Of course, I don't claim the evidence like this should be dismissed in a behavioural research of the fossil animals, but to be cautious in drawing the conclusions.

Dog's trackway in a shallow snow (last Winter). Note the drag marks. Apparently, the drag mark (from the two middle claws of both the front and the hind limbs) is made on two occasions: when the foot has been closing in to meet the ground and also on the way up when the foot was in the process of raising form the ground. Dog was going from right to the left.



This ankylosaur trackway from Pula is about 50-60 meters long with mostly poorly preserved footprints. Unfortunately some of the footprints have been lost forever due to the covering with the concrete to make place for sunbathing (this is a tourist resort). At the end of the trackway there are some individual footprints of an animal of giant proportions. The ankylosaurs that left the tracks were probably of a Polacanthinae type.



The left pes footprint is quite nicely visible in the left lower part of the photograph. The one that is a bit higher to the right is poorly preserved. These are positives (casts). The manus prints were preserved only on a couple of places.
There's also another ankylosaur outcrop a couple of km away with some very nicely preserved tracks (see some of the previous posts in my blog). The ankylosaur trackways are quite rare. One of the reasons might be that they are being miss interpreted, because they can easily be mistaken for ornithopod or sauropod tracks. To tell you the truth I first thought these were left by iguanodontoids and sauropods. At the other site I even thought initially, that I have been looking at the theropod tracks. Only later it dawned to me it was an ankylosaur trackway.

 The sites are still not described. I am the only one that knows about these, although this is a tourist beach. they are not easy to notice.


Sauropod trackway (Pula 2009)



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Dangerous waters: A crock farm in Thailand (November/ 2013)




Monday, 18 August 2014

Excitement over a new Spinosaurus aegyptiacus mount.

Spinosaurus: Lost Giant of the Cretaceous

National Geographic writes:" It was the largest predatory dinosaur, with spike-shaped teeth and a body over 50 feet long.“It” was Spinosaurus, and although it was a giant among dinosaurs, its fossils eluded scientists for decades. Now two dedicated paleontologists, Paul Sereno and National Geographic 2014 Emerging Explorer Nizar Ibrahim, are reconstructing a complete skeleton of this prehistoric giant that was bigger than T. rex.... "
The event (with the main attraction: presentation of the new mount) will be at the National Geographic Museum in Washington, D.C. in October 2014.

About 14 years ago. I wrote an article on Spinosaurus in the Japanese dinosaur  magazine.
Enigmatic Spinosaurus  Text & Illustration by Berislav Krzic

It is interesting that some of my  assumptions and conclusions regarding the strange anatomy of spinosaurids still stand. See some of my drawings below.

  Any interested enthusiast and professional should obtain the magazines, which are still available at the bargain price.

The premier dinosaur magazine from Japan! The Dino Press periodical series was published in 2000 - 2002. Contains information about dinosaurs, pterosaurs, marine reptiles, and a variety of extinct animals from past geologic time periods. Well-known paleontologists, illustrators, and sculptors from all over the world contributed to Dino Press with their latest and interesting reports, theories, paintings, photos, and other work relevant to the scope of the magazine.
Beautiful and in-depth. Written in Japanese, with an accompanying B/W transcript of the text in English (including caption and figure descriptions).



 My Spinosaurus aegyptiacus reconstruction from 2000-2001


 My Spinosaurus aegyptiacus back-sail reconstruction from 2000-2001 and Stromer's original Spinosaurus skeleton reconstruction from 1915 (below):

Above are my revisions of Baryonyx walkeri skull and skeleton from Charig and Milner  

 Charig, A.J. and Milner, A.C. (1997). "Baryonyx walkeri, a fish-eating dinosaur from the Wealden of Surrey." Bulletin of the Natural History Museum of London, 53: 11–70.

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A few other images that have nothing to do with the above ones.

My classic, now a bit outdated, Phobosuchus/Deinosuchus croc restoration and and Allosaurus speculative embryo restoration (below)
My daughter pointing at the Cretaceous marine reptile Pontosaurus, exhibited at the CNHM in Zagreb (some 20 years ago!)



Tuesday, 12 August 2014

A little predator on a hunting spree

A short film I shot a few years ago.

video

Now imagine how a huge theropod like T. rex might have looked like while searching for its prey.


Here is my Torosaurus (mother with offspring) restoration from 2003.


I wonder if my illustration of Torosaurus chasing Paleosaniwa that has stolen one of it's eggs, is still on display at the Peabody Museum (Yale)? It has been 11 years since it was put as a part of the permanent exhibition. Time flies!