Tag: Geology

Ichnoplanet alumna Kaitlin Lindblad’s paleoart published in the Journal of Vertebrate Paleontology

Leave a comment

Kaitlin Lindblad who completed her master’s degree working on crocodyliforms from Saskatchewan has had her paleoart featured in a new article, the ontogenetically youngest known pachycephalosaur (Dinosauria: Ornithischia) postcranium, in the Journal of Vertebrate Paleontology.

Researchers Bryan R. S. Moore, David C. Evans, Michael J. Ryan, R. Timothy Patterson, and Jordan C. Mallon found disarticulated pachycephalosaur remains including vertebral, hindlimb, pelvic and postcranium material in uppermost Maastrichtian Frenchman Formation in southern Saskatchewan. Given the lack of diagnostic material, they do not assign the fossil (CMNFV 22039) a taxonomic identity, however Sphaerotholus buchholtzae is considered the most likely candidate given the stratigraphic age and geographic location of the specimen. Morphometric analysis of CMNFV 22039 suggests that the skeleton is that of an early-stage juvenile and very likely the youngest pachycephalosaur ever recorded. This is supported by the sample’s small size and histological analysis showing a rapidly growing woven bone of the tibia and fibula. This research is key for understanding the growth and development of pachycephalosaurs.

FIGURE 18. Life reconstruction of CMNFV 22039 in an environment typical of the upper Maastrichtian Frenchman Formation. Illustration by Kaitlin Lindblad. Used with permission.

Check out the research in JVP here.

Written by Zane Gabriel Goodell

Psammichnites from the Pennsylvanian Rod El-Hamal Formation of Egypt: revisiting paleoenvironmental and paleogeographic patterns of distribution of late Paleozoic ichnospecies

Leave a comment

New research has just been published in Ichnos by authors Ahmed A. El-Refaiy, Luis Buatois, Magdy M. El Hedeny, Ahmed M. El-Sabbagh, Ahmed N. El-Barkooky and Ahmed S. Mansour on Psammichnites in the Pennsylvanian Rod El-Hamal Formation of Egypt.

The researchers found high density occurrences of three different ichnospecies of Psammichnites preserved in the rippled troughs of sandstones in off-shore transition settings. Global compilation of Psammichnites show its presence in marginal and fully-marine deposits, showing its tolerance to brackish to normal marine salinity conditions. Psammichnites appears to be a cosmopolitan ichnogenus showing a broad latitudinal distribution during the late Paleozoic, having been particularly widespread during the Pennsylvanian.

Figure 3. Psammichnites ichnospecies from the Pennsylvanian Rod El-Hamal Formation, Wadi Araba, Eastern Desert of Egypt. Scale bars are 2.5 cm. (A–D) Psammichnites plummeri (Fenton & Fenton,1937). (E–H) Psammichnites grumula (Romano & Meléndez, 1979). From El-Refaiy et al. (2026).

Learn more about this research published in Ichnos here.

Written by Zane Gabriel Goodell

Delving into the early Cambrian Cranbrook Lagerstätte of western Canada: an ichnologic analysis

Leave a comment

New research from PhD candidate Alejandro Corrales-García, Gabriela Mángano and Jean Benard-Canon was just published on Burgess-shale type deposits from southeastern British Columbia.

A 2015 investigation of a 2.65 m interval recovered 12 ichnotaxa and three types of trace fossils left in open nomenclature, the most frequent including Helminthoidichnites tenuis, Palaeophycus tubularis, Diplocraterion isp., and finger-like structures (FLS). Overall, the Cranbrook assemblages do not present well-defined tiering structures and represent surficial epifauna and shallow-tier infauna that colonized the sea bottoms during brief windows between episodic flows and inhabited dysoxic to relatively well-oxygenated outer shelf environments. This study gives us additional insight into the behavior of soft-bodied organisms in some of the most recognizable deposits representing early animal life.

Figure 2. Trace fossils and physical sedimentary structures in the Diplocraterion isp. Ichnocoenosis. (1) General bedding-plane view of Bergaueria isp. (Be) and Diplocraterion isp. (Di) and close-ups of polished cross section showing typical claystone with thin intercalations of coarser grains in thin and discontinuous laminae displaying starved ripples and associated cross-lamination (yellow arrows), passively filled burrows (white arrow), and ruptured laminae of fine-grained sand (red arrows). (2) Bedding-plane view with close-up of Diplocraterion isp. with fine-grained sand fill. (3) Bedding-plane view displaying Diplocraterion isp. with fine-grained sand fill in incidental association with a Tuzoia carapace. Notice deformation of Tuzoia-bearing laminae by the overprinting burrow. (4) Bedding-plane view displaying stick-like individuals. Notice common individuals having slightly broader ends. All scale bars = 10 mm.

To learn more, check out the paper published in The Journal of Paleontology here.

Written by Zane Gabriel Goodell

Ichnofabrics and temporal disjunction: Miocene continental trace fossils in the Precambrian basement of the Orinoco Oil Belt of Venezuela

Leave a comment

A new paper was published in Ichnos by Luis Buatois, Euridice Solórzano, Williams Rodríguez, and Gabriela Mángano examining Precambrian continental trace fossils in Venezuela.

This study documents a specific type of simple ichnofabric referred to as an unconformity-bound simple ichnofabric. The well cores in this study feature the Precambrian basement of the Orinoco Oil Belt hosting continental ichnofossils attributed to Taenidium. The bioturbation is interpreted to have be produced in the Miocene in a regolith formed on top of the Precambrian basement. The ichnofabric found here is similar to ultracomposite ichnofabrics in that it involves a significant difference in time, but it is still considered a simple ichnofabric due to representing a single bioturbation event. This study highlights the importance of recognizing temporal disjunctions in the stratigraphic record that may mislead researchers about evolutionary events.

Metamorphic basement and monospecific ichnocoenosis of the meniscate backfilled trace fossil Taenidium isp. (Ta) in the Ayacucho area in the Orinoco Oil Belt. (A) Precambrian quartz micaceous schist. (B) Taenidium isp. (Ta) in basement regolith. (C) oil-impregnated sands (OS) from fluvial Miocene Oficina Formation filling Taenidium isp. Figure 3. from Buatois et al., 2026.

Check out the paper in Ichnos here.

Written by Zane Gabriel Goodell

Congratulations Dr. Kai Zhou!

Leave a comment

We have another successful thesis defence from our lab! Congrats to newly minted Dr. Kai Zhou on the successful defence of his PhD thesis.

Kai studied carbonate ichnology of the upper Miocene complex of the Las Negras area, Almeria, southeastern Spain, within a paleoenvironmental and sequence stratigraphic framework.

We are excited to see where you take your career. Congratulations on this monumental achievement!

Written by Jack Milligan