Jakub Sakala

Jakub Sakala
Charles University in Prague | CUNI · Institute of Geology and Paleontology

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56
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Publications

Publications (56)
Article
The recently described fossil plant Tichavekia grandis from the upper Silurian of the Barrandian area (Czech Republic) contributed to our understanding about the early land plant diversity, but it raised also many questions. Megafossils, preserved as coalified compressions, come from the Kosov Quarry near Beroun from the Požáry Formation of Neocolo...
Article
A unique homoxylous wood is described from the Albian Lewis Hill Member of the Whisky Bay Formation on James Ross Island as Mixoxylon australe Chernomorets & Sakala, gen. et sp. nov. This fossil taxon shows an unusual combination of features in having indistinct growth rings with a significantly wider earlywood zone than latewood zone, tracheids wi...
Article
A new fossil species Odontosoria marekgaltieri sp. nov. from the lower Miocene Most Basin, Czech Republic is presented. Main characteristics of frond and pinnule morphology, and especially reproductive organs with in situ spores show a relationship to the living fern genus Odontosoria Fée (Lindsaeaceae). Odontosoria. marekgaltieri shows morphologic...
Article
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Fossil flora imprints have been found during remediation works on the road no. 262 Děčín – Benešov nad Ploučnicí, running through Soutěsky Pass and cutting through a lahar sequence of the České středohoří Volcanic Complex by the remediation company employee. The exposed lahar sequence belongs to the Děčín Fm. (sensu Cajz 2000), where Oligocene flor...
Article
Three types of charcoalified fossil homoxylous woods are described from the Upper Cretaceous of the Bohemian Cretaceous Basin: Podocarpoxylon sp.,?Podocarpoxylon vel Taxodioxylon sp. and Protocupressinoxylon sp. They come from the uppermost part of the Peruc-Korycany Formation, which is mid-Cenomanian in age. Podocarpoxylon sp. shows distinct growt...
Chapter
The development of grassland ecosystems across most continents was a multistage process involving the appearance of open-habitat grasses in the Paleogene, the mid-late Cenozoic spread of C3 grass-dominated habitats, and, finally, the Late Neogene expansion of C4 grasses at tropical and subtropical latitudes. In addition, the timing of these evoluti...
Article
Since 1855, 25 different fossil wood types belonging to conifers (Cupressaceae s.l. with two different types of Taxodioxylon gypsaceum: root- and stem-wood), and angiosperms (families Magnoliaceae, Lauraceae, Platanaceae, Altingiaceae, Cercidiphyllaceae, Ulmaceae, ?Moraceae, Juglandaceae, Betulaceae, Malvaceae s.l., Sapotaceae, Oleaceae, one palm s...
Article
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The pantropical Picrodendraceae produce mostly spheroidal to slightly oblate, echinate pollen grains equipped with narrow circular to elliptic pori that can be hard to identify to family level in both extant and fossil material using light microscopy only. Fossil pollen of the family have been described from the Paleogene of America, Antarctica, Au...
Article
New petrified wood descriptions improve our knowledge on the forest structures of Neogene of Turkey. With this study, a total of six petrified wood pieces were studied from Alaçam Village of Dursunbey (Balıkesir), Tunçbilek-Yeniköy and Tunçbilek-Çukurköy fossil site (Tav¸sanlıTav¸sanlı-Kütahya). Four types of woods were described from the samples a...
Article
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On November 2015 Lesbos Island has faced an ultimate recognition as one of UNESCO's Global Geoparks, an honor of its international significance based on its geological treasure as revealed by the existence of the famous early Miocene Petrified Forest and the variety of its geosites. The aim of this study is to draw a holistic approach for the palae...
Article
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Alonissos (Iliodroma) Island is really famous to palaeobotanists because of the type locality of Glypto­strobus europaeus (Brongniart) Unger only. Since the first report of the latter holotype no palaeobotanical work has taken place in Alonissos. This is the first research of the fossiliferous locality, along with new palaeobotanical, palynological...
Article
A relatively rich association of six species of embryophyte plants is known from the upper Silurian of the Prague Basin (Bohemian Massif, Czech Republic). All stratigraphically controlled specimens come from the Neocolonograptus parultimus-Neocolonograptus ultimus Zone of the Přídolí. A new genus and species, Tichavekia grandis Pšenička, Sakala et...
Article
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Prof. Pál Greguss (*1889, †1984) was a leading figure in European (palaeo)xylotomy. His collection of types and figured specimens from the Cenozoic of Hungary published in the two monographs (Fossil gymnosperm woods in Hungary from the Permian to the Pliocene and Tertiary angiosperm woods in Hungary), now stored in the Palaeobotanical Collection of...
Conference Paper
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During our recent palaeobotanical study of the Eastern Mediterranean (Lesbos and Lemnos Islands, Greece), new results on the Cainozoic fossil woods, both angiosperms and conifers, came out: a new methodology/identification key for the identification of lauraceous woods and especially Laurinoxylon species and their botanical affinities after the app...
Article
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In Kralupy nad Vltavou and its surroundings, the Upper Cenomanian Peruc-Korycany Formation of the Bohemian Cretaceous Basin represents an important and well-accessible geological element to such a degree that the profile in Hostibejk was chosen as a stratotype of the Korycany Member. We report here about a new locality situated to the north of the...
Article
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Type specimens and other material of Comptonia difformis (Sternberg) Berry (Myricaceae) from the Most Basin, North Bohemia, have been re-investigated in order to obtain more complete information on the leaf morphology, epidermal structure and co-occurring fruits. The history, paleoecology and comparisons with similar fossils from Eurasia and extant...
Article
The Petrified Forest of Lesbos has been the subject of the palaeobotanical research since the 19th century, but a number of inconsistencies still remain. One of them concerns the fossils described over 100 years ago that are characterized by lack of the accompanied illustrations, missing or even lost type material, rather general and uninformative...
Poster
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Lauraceae is a family distributed worldwide with about 50 genera and more than 2500 species of mainly evergreen woods and shrubs. The fossil Tertiary members of Lauraceae in Europe are important because they are the most common trees and generally indicate warm climate with high humidity at the atmosphere even during the coolest season. Laurinoxylo...
Article
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Several specimens of Lauraceae fossil wood from the Cenozoic of Greece (southern part of Lesbos), the Czech Republic (Kadaň-Zadní Vrch Hill and Jáchymov), and Hungary (Ipolytarnóc) were studied. When considering whether they belonged to the speciose fossil wood genus Laurinoxylon, we reviewed the literature and data from InsideWood on fossil and mo...
Article
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New fossil woods are described from the Paleogene volcanoclastic sediments of Doupovske hory (localities Vrbice and Nechranice) and Česke středohoři Mts. (localities Bečov and Divoka rokle). Three types of conifer woods were identified (two stem woods and one root wood of Cupressaceae s.l.) and six types of angiosperm woods (families Lauraceae, Bet...
Article
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The description of the Cenomanian sandstone of the Motyčín rock in Kladno is provided. Its lithological character, which shows some similarities with the Korycany Member sandstone from both Pecínov and Kralupy, together with intermediated geographical position between the two localities emphasize its importance for possible correlation in a larger...
Article
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Araucarioxylon Kraus is a widely known fossil genus generally used for woods similar to that of the extant Araucariaceae. However, since 1905, several researchers have pointed out that this name is a junior nomenclatural synonym and, as such, a nomen illegitimum. At least four generic names are in current use for fossil wood of this type: Agathoxyl...
Article
Full-text available
Araucarioxylon Kraus is a widely known fossil-genus generally applied to woods similar to that of the extant Arau- cariaceae. However, since 1905, several researchers have pointed out that this name is an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood of this type: Agathoxylon Hartig, Arauc...
Article
Full-text available
Araucarioxylon Kraus is a widely known fossil-genus generally applied to woods similar to that of the extant Araucariaceae. However, since 1905, several researchers have pointed out that this name is an illegitimate junior nomenclatural synonym. At least four generic names are in current use for fossil wood of this type: Agathoxylon Hartig, Araucar...
Article
Full-text available
A new species of Antarctoxylon is described from the Coniacian Hidden Lake Formation of James Ross Island as A. mixai Sakala, sp. nov. This angiosperm fossil wood shows a unique combination of features in having indistinct growth ring boundaries, scalariform perforation plates with about 30 bars and rays both narrow (1–6-seriate) and very wide (up...
Article
Numerous coalified tree stumps remained preserved in-situ in the so-called “Stump Horizon” (the palaeontologic horizon No. 31), which represents clayey overburden of the main coal seam in the Bílina open cast mine in the Most Basin (Czech Republic). The petrological and chemical composition, palaeobotanical origin and preservation of 24 selected tr...
Article
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The present contribution brings new scientific data for the palaeoflora of Lesbos based on new collections of plant fossils which were discovered in 2011 at six new localities from the southern part of Lesbos Island. This study resumes the published data both on the palaeovegetation of the Petrified Forest and the palaeogeography of Lesbos Island d...
Article
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The late Paleozoic deposits in several basins in the Czech Republic are well known for their abundance of silicified stems. Despite the fact they have been known since 19th century, there are few modern works of this material. The stems have been known to occur at several stratigraphic levels. During the course of recent field work such material ha...
Article
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Fossil plants from Late Cretaceous strata (Hidden Lake Formation and Santa Marta Formation) of James Ross Basin exposed in the northern part of the James Ross Island are preliminary described. Both formations contain plant mega fossils, petrified wood, and charcoalified mesofossils. Fossil plants from the Hidden Lake Formation are represented by le...
Article
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The silicified stem from Kučlín was first attributed to Podocarpoxylon helmstedtianum and linked with the co-occurring remains of Doliostrobus. Later it was re-interpreted as Tetraclinoxylon vulcanense and associated with twigs and seeds of Tetraclinis. The new anatomical comparison reveals that exact botanical affinities of the silicified stem can...
Article
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A new species of the morphogenus Rhysocaryoxylon Dupéron (Rhysocaryoxylon madsenii Sakala & Gryc sp. nov.) is described from the Lower Eocene of the Fur Formation, Mors island, Denmark. This permineralized fossil angiosperm wood is semi-ring-porous with distinct growth ring boundaries, vessels solitary or in radial multiples of 2–5, perforation pla...
Article
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A new silicified angiosperm wood from the alluvial sediments in Važany nad Litavou (SW of Slavkov/ Austerlitz near Brno, Vyškov district) is described. The wood is diffuse-porous with indistinct growth ring boundaries. Vessels are exclusively solitary with helical thickenings and scalariform perforation plates. Rays are very high and up to 18 cells...
Article
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A variety of fossil woods occur on the northern margin of the Doupovske hory Volcanic Complex in the northwestern part of the Czech Republic. The woods were buried by three different processes reflecting three different settings. First, a large area between the towns of Kadan and Klasterec is covered by an up to 100 m thick sequence of lahar and de...
Article
Petrographic imaging, in combination with qualitative and quantitative instrumental analyses of mineral mass, allow us to obtain material signatures of silicified plant stems that are relatively common in sediments of continental basins since the late Palaeozoic. These fossils can be found in their original strata but commonly have been removed fro...
Article
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GRYC, V., SAKALA, J.: Identifi cation of fossil trunks from Bükkábrány newly installed in the Visitor Centre of the Ipolytarnóc Fossils Nature Reserve (Novohrad – Nógrád Geopark) in Northern Hungary. Acta univ. agric. et silvic. Mendel. Brun., 2010, LVIII, No. 5, pp. 117–122 The Late Miocene forest was discovered in the opencast lignite mine of Bük...
Article
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Silicified trunks, colloquially called “araukarity”, are plentiful plant fossils of the Late Pennsylvanian in the Czech part of the Intra Sudetic Basin (ISB) in NE Bohemia. They are predominantly embedded in Žaltman Arkoses, a unit of fluvial sediments deposited during Barruelian, Late Carboniferous. This unit is a part of the Odolov Formation with...
Article
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A systematic overview of the conifer macrofossils (leaves, cones, seeds and wood) from the Lower Miocene of the Most Basin (Czech Republic) is presented and nine natural units (botanical species) are defined, belonging to three species of Pinus L. and one species of Pseudolarix GORDON, Quasisequoia SRINIVASAN & FRIIS emend. KUNZMANN, Taxodium RICHA...
Article
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The first permineralized angiosperm wood from the Cenomanian of the Bohemian Cretaceous Basin (Czech Republic) is described. The wood is diffuse porous, with vessels solitary and in radial multiples of 2–5, perforation plates are exclusively simple, and tyloses abundant. Rays are usually 4–7-seriate and heterocellular, narrower rays are rare. The f...
Article
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The described silicified stems of calamites come from sediments near the town Nová Paka, which are of the Stephanian C age. All of them are characterized by an alternation of interfascicular rays and fascicular wedges with only one type of tracheids and important amount of parenchyma, so they belong to the form genus Arthropitys Goeppert. Cathodolu...
Article
A fossil tree was discovered during the 16th century at Jáchymov (Bohemia). The wood was first named by Unger, in 1842, Ulminium diluviale. But it belongs to the Lauraceae family and Felix, in 1883, named it Laurinoxylon diluviale. The authors give the history and the geological setting of the area and describe the anatomy of the wood. The diagnosi...
Article
Editorial. In 2006 Europe was host to several international meetings focusing on palaeobotany and palynology. One of these majormeetings was the 7th European Palaeobotany-Palynology Conference, 6–12th September, 2006 in Prague. Around 300 palaeobotanists and palynologists from more than 40 countries including several in Europe, Argentina, China, Eg...
Article
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The methods in palaeoclimate reconstruction are either taxonomically controlled with the need to identify fossil specimens or not requiring identifi cation of a fossil. The differences between the two types of methods were demonstrated on fossil wood fl oras from the Tertiary of Central Europe. The Tertiary of north-western Bohemia (Czech Republic)...
Article
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The article presents fossilized plant remains from the Uzon caldera in Kamchatka for the first time. A problematic plant remain from diatomite, undetermined plant bulbs and several pieces of silicified herbs and wood as small stems and branches were recognized. Based on microscopic structure, one piece of stem was attributed to the genus Salix L. A...
Article
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SUMMARY Two species of fossil angiosperm wood are described from the Oligocene of northwestern Bohemia in the Czech Republic. One specimen from Kadan-Zadní vrch Hill is identified as Cercidiphylloxylon kadanense Prakash et al. Because of its superior preservation, the specimen is des- ignated as an epitype to the original holotype specimen of the s...
Article
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A big silicified trunk from the Late Eocene locality of Kučlín was originally identified as Podocarpoxylon helmstedtianumGottwald and preliminarily associated with co-occurring twigs and cone scales of Doliostrobus taxiformis (Sternb.) Z.Kvaček. However, the new diagnosis of the genus Doliostrobus, recently complemented by the characteristics of se...
Article
A fossil angiosperm wood is described for the first time from the famous Early Miocene locality of Bı́lina. It represents a fossil elm wood, attributed to Ulmoxylon marchesonii Biondi. The fossil wood can be compared to extant North American soft elms, also to Ulmus macrocarpa Hance and U. parvifolia Jacq. from China or to the European common elm U...
Article
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The present article gives the first results of the thesis of Jakub Sakala, concerning an interesting find of wood of Castanea-type from the Upper Oligocene sediments of the locality Velka‡ ‰Cernoc of northern Bohemia. This locality, together with other localities of the so-called "Neogene accumulations of central Bohemia", was recently studied in d...
Article
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The systematic part of the study of the Dangu locality, dealing with angio- sperm wood, is completed. In addition to three previously described types (two species), two others (Dichrostachyoxylon cf. zirkelii and Anogeissus sp.) are described. A new combination Dichrostachyoxylon sahabiense (Louvet) n. comb. is proposed. The locality as a whole ref...
Article
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In the roof of the main lignite seam in the locality Důl Bílina (Bilina Mine) of northern Bohemia, a fossil flora with 51 different taxa has been described. Unique state of preservation has allowed application of the cuticular analysis and the analysis of the pollen in situ . The assemblage is parautochthonous and reflects azonal vegetation, typica...
Article
A twig fragment with attached verticillate leaves and capsules with intact seeds was recovered from the Lower Miocene lignitic clay in the Bı́lina strip mine (northern Bohemia). The seeds correspond to those known in dispersed condition as Decodon gibbosus (E.M. Reid) E.M. Reid in Nikitin, while the foliage matches that which has been called Ficus...
Article
The problem of root wood is discussed. Based on several specimens of silicified wood from the Dangu locality (Lower Eocene of the Paris Basin), the authors have attempted to explain variations in the wood structure by the origin of the studied woods within the tree. A new species with two new forms is also established.RésuméLe probléme du bois de r...