Jörg Maletz

Jörg Maletz
Freie Universität Berlin | FUB · Institute of Geological Sciences

Dr. rer. nat. habil.

About

286
Publications
80,123
Reads
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3,834
Citations
Citations since 2016
98 Research Items
1738 Citations
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
2016201720182019202020212022050100150200250300
Additional affiliations
May 2010 - September 2011
Colorado State University
Position
  • Collaborate Research, NSF Project Ear-0844213
Description
  • Senior Research Scientist
October 2009 - April 2010
St. Francis Xavier University
Description
  • W. F. James Visitinig Professor of Pure and Applied Sciences
January 2002 - August 2009
University at Buffalo, The State University of New York
Position
  • State University of New York
Description
  • Visiting Assistant Professor

Publications

Publications (286)
Article
Full-text available
Graptolites can be identified as a group of clonal, colonial pterobranchs with numerous extinct members and a few extant ones, secreting a characteristic housing structure, the tubarium. The zooids of the extant genus Rhabdopleura can be regarded as a general model to reconstruct graptolite zooids, but may not represent precisely the soft-body anat...
Book
Full-text available
The graptolites constitute one of the geologically most useful taxonomic groups of fossils for dating rock successions, understanding paleobiogeography and reconstructing plate tectonic configurations in the Lower Palaeozoic. Graptolites were largely planktic, marine organisms, and as one of the first groups that explored the expanses of the world’...
Article
Hemichordata and especially the Pterobranchia (Cephalodiscida and Graptolithina) can be regarded as useful examples to understand the fossil preservation of organically preservable (non-mineralized) fossils through geological history due to the commonality of their fossils in Palaeozoic sediments. The organisms consist of organic materials of three...
Article
A collection of Lower Ordovician graptolites from Skattungbyn, Dalarna, central Sweden, prepared by Roland Skoglund, reveals a number of taxonomically and biostratigraphically important taxa. From several thousand chemically isolated specimens, the biostratigraphically useful taxa Acrograptus(?) gracilis (Törnquist), Baltograptus extremus Maletz &...
Article
The evolution of the Retiolitinae marks one of the most important events in the evolution of the planktic graptolites (Graptoloidea), leading to a diversification of genera and species in the early Silurian oceans still highly underestimated and poorly understood. The complex tubarium construction of the Silurian Retiolitinae is reviewed using a un...
Article
A revision of the early Tremadocian graptolites of the genus Rhabdinopora shows that Rhabdinopora proparabola from the Xiaoyangqiao section, Dayangcha, North China is the oldest species of the genus. Early Tremadocian species of Rhabdinopora can be differentiated easily by the construction of their nemata. The earliest species, Rhabdinopora propara...
Article
The description of benthic Graptolithina of the Guole Biota provides a first insight into the diversification of the late Cambrian (Furongian) graptolites as few faunas have been described from the interval, sometimes termed the Furongian Gap. Species of the families Rhabdopleuridae (Rhabdopleura sp.), Dendrograptidae (Dendrograptus sp.), Callograp...
Article
Extant and fossil pterobranchs show distinct symmetry conditions of the individual zooids and their tubaria that are not necessarily comparable. The strict bilateral symmetry in the zooids of extant Cephalodiscida is modified to a considerable anatomical asymmetry in extant Rhabdopleurida. This type of left–right asymmetry can be recognized as anti...
Article
The Krapperup drill core from Scania (Skåne), southern Sweden, includes one of the most important graptolitic Darriwilian (upper Middle Ordovician) successions of Baltica. Only some intervals have been documented previously and especially the uppermost part of the succession has been completely unknown. A fairly complete succession of mid- to late...
Article
An Euconochitina symmetrica Zone was defined in the G-locality at Lévis, Quebec, within an interval belonging to Zone A of Raymond that contains Paratetragraptus approximatus. The interval was consequently attributed to the Floian. E. symmetrica was also recognized in Northern Gondwana, and the species was considered an undisputed marker for the ba...
Article
Eduard Suess was one of the first scientists to describe graptolites from the Czech Republic. He erected one new genus and several new species. However, some of the material used for his descriptions has never been identified and the concept of the taxa was not verifiable. Some of the specimens are now recognized in the Bilimek collection (Universi...
Article
Full-text available
The Mora 001 and Solberga 1 drill cores provide the best available overview on the early Silurian (Llandovery, Rhuddanian to Telychian) graptolite succession available for the Siljan Ring impact structure of central Sweden. The Solberga 1 succession includes a nearly complete graptolite succession from the Pernerograptus revolutus Biozone (late Rhu...
Article
The graptolite succession of the YD‐1 drill core provides a new view into the lower Silurian (Llandovery) biostratigraphy of the Yichang region on the Yangtze platform of China. A thick succession of black to greenish, fine to silty shales and siltstones with a variable amount of poorly to well‐preserved graptolite faunas ranges from the upper Ordo...
Article
Full-text available
The Tielugou section, Shennongjia Anticline, Hubei Province (China) includes a relatively complete succession of Hirnantian (latest Ordovician) to basal Telychian (Llandovery, early Silurian) graptolite faunas. The section shows the first record of a fauna of the late Aeronian Stimulograptus halli Biozone from South China, even though the index spe...
Article
Based on the comprehensive study of two sections and one borehole in the Middle Yangtze area, fruitful chitinozoan specimens were obtained. An optimized scheme of the chitinozoan biozonation across the Aeronian-Telychian boundary is proposed. Five chitinozoan biozones are recognized, including the Conochitina emmastensis Biozone, Conochitina malleu...
Article
In 2019 the Sub-Commission on the Ordovician System approved the Xiaoyangqiao section, North China as a new ASSP section for the base of the Ordovician System. The sedimentary succession of the section is exposed in a natural outcrop near the Dayangcha Village at a position of 42°3'24''N, 126°42'21''E. It has a well-preserved, abundant and diverse...
Article
The Dapingian and lower Darriwilian graptolite succession of the Krapperup drill core from Scania, southern Sweden, provides a detailed insight into the axonophoran (biserial) graptolites and their early Palaeozoic evolutionary changes on the Scandinavian platform. Even though earliest Darriwilian axonophorans are not represented, the succession in...
Article
Full-text available
Rock specimens and contained fossils collected in 1976 from a submarine tunnel driven between Herøya and Rafnes in the Skien–Langesund area of southern Norway, have been restudied. The contained fossils include olenid and agnostoid trilobites, graptolites and brachiopods, groups described in detail for the first time from the area and documenting a...
Article
Full-text available
The largely covered Middle Ordovician succession in the classic geological Röstånga area in northwestern Scania has not been studied for some 80 years. A new drill core through a succession ranging from the lower–middle Darriwilian to the lower Sandbian has provided a unique opportunity to investigate the graptolite biostratigraphy and the δ13Corg...
Article
Trilobite development has been intensively explored during the past decades, but information on ancestral character combinations in the early developmental stages of trilobites remains unknown. Trilobites of the superfamily Olenelloidea are one of the earliest diverging groups. Study of their development coupled with the development of other early...
Article
The graptolite biostratigraphy of the 116.11-m-long Röstånga-2 drill core from Scania, southern Sweden, includes the Darriwilian (Middle Ordovician) Holmograptus lentus, Nicholsonograptus fasciculatus, Pterograptus elegans, Pseudamplexograptus distichus and Jiangxigraptus vagus biozones, and the lower Sandbian (Upper Ordovician) Nemagraptus gracili...
Article
Devonian and Carboniferous dendroid graptolites from Belgium are evaluated and partly revised. New finds in two different stratigraphic intervals of the ‘Carrière de Lompret’, an active quarry exploiting Frasnian limestones and shales east of Frasnes-lez-Couvin, allow the identification of Callograptus sp. and Dictyonema fraiponti, both belonging t...
Article
The upper Middle to basal Upper Ordovician succession (Darriwilian to Sandbian) of the Fågelsång-3 drill core provides new important information on the graptolite biostratigraphy of Scania, southern Sweden. The Scanian succession is known largely from drill cores and a few scattered outcrops exposing only parts of the interval. The Darriwilian Alme...
Article
The early evolution of the Hemichordata (Enteropneusta and Pterobranchia) based on the available fossil record has its challenges and highlights. Even though the pterobranchs (Cephalodiscida and Graptolithina) secrete a highly durable housing construction or domicile (the tubarium), their fossil record is largely restricted to the tubaria of the pl...
Article
Infraorder NEOGRAPTINA Štorch, Mitchell, Finney, & Melchin, 2011 [Neograptina Štorch, Mitchell, Finney, & Melchin, 2011, p. 368] [=family Monograptidae Lapworth, 1873 sensu Mitchell, 1987, p. 390; =suborder Monograptina of Mitchell & others, 2007] Biserial, uni-biserial, and uniserial graptoloids lacking proximal spines except for the virgellar sp...
Article
The Cambrian–Ordovician boundary interval exposed at the Xiaoyangqiao section, North China is presented. The distribution of stratigraphically important fossils in the Xiaoyangqiao section revealed several nearly coeval graptolite, conodont, trilobite, and acritarch bioevents in the uppermost Cambrian–lowermost Ordovician carbonate-siliciclastic se...
Article
Chemically isolated specimens of two species of the lower Silurian (Llandovery, mid- to upper Aeronian) biform monograptid genus, Paramonoclimacis, from Arctic Canada show tubarium features evolutionarily linking it to the Streptograptus clade. The tubaria, coiled dorsally in the proximal end, show a number of streptograptid thecae with the distinc...
Article
Full-text available
Aus graptolithenführenden Kieselschiefern wird, erstmals für Ostthürin-gen, das Telson eines Eurypteriden beschrieben und der Familie Ptery-gotidae zugewiesen. In devonischen Sedimenten offen-mariner, tieferer Ablagerungsbereiche sind Reste von Angehörigen dieser Familie die häufigsten und oft einzigen Seeskorpion-Nachweise. Das lässt sich ei-nerse...
Article
Dictyonema retiforme has been regarded as the benthic ancestor to the planktic Graptoloidea, represented by the earliest planktic Rhabdinopora flabelliformis and its descendants. The revision of the type material of Dictyonema retiforme, the type species of the genus Dictyonema, from the Silurian of New York State shows compound stipes formed by th...
Article
The Ordovician Tøyen Shale Formation of the recently retrieved Fågelsång-3 drill core provides some important information on the graptolite biostratigraphy of the unit and its completeness in the region. The drill core reached downwards into the Kiaerograptus supremus Biozone of late Tremadocian age. Above a major fault zone, faunas with a number o...
Article
A recent core drilling in the geologically classical Fågelsång area resulted in a 58.70-m-long drill core through the lowermost Sandbian Sularp Shale, the Darriwilian Almelund Shale and Komstad Limestone, and part of the late Tremadocian to earliest Darriwilian Tøyen Shale. The shales contain zone index graptolites that are used for an update of th...
Article
Subclass GRAPTOLITHINA Bronn, 1849 [Graptolithina Bronn, 1849, p. 149] [=Rhabdophora Allman, 1872, p. 380] [incl. order Rhabdopleurida Fowler, 1892, p. 297; order Rhabdopleuroidea Beklemishev, 1951, p. 414; order Graptovermida Kozłowski, 1949, p. 204, herein] Pterobranchs with a colonial habit, building a tubarium from individual fusellar rings...
Article
The Lower Ordovician Bjørkåsholmen Formation at Flagabro, Scania, southern Sweden, consists of a 0.8 m thick succession of carbonates with three siliciclastic mudstones, 5, 1 and 100 mm thick, intercalated in the central part of the unit. Carbonate and siliciclastic mudstone beds show both normal and inverse grading. The carbonates are mud-rich and...
Article
Every student of palaeontology will stumble upon the term ‘graptolite’ at some point and will wonder what these strange little fossils mean. Thought to be long extinct, the few living graptolites and their extinct relatives have been united quite recently by palaeontologists through cladistic analysis. Not that the extant graptolites were overlooke...
Article
Every student of palaeontology will stumble upon the term ‘graptolite’ at some point and will wonder what these strange little fossils mean. Thought to be long extinct, the few living graptolites and their extinct relatives have been united quite recently by palaeontologists through cladistic analysis. Not that the extant graptolites were overlooke...
Article
The Lower Mississippian upper shale member of the Bakken Formation in the Williston Basin, North Dakota, consists of organic-rich, black, siliciclastic mudstones deposited offshore on a low-gradient shelf; 12 fine-grained facies are recognized and grouped into 5 facies associations (FAs). Very fine-grained, massive to faintly laminated mudstone (FA...
Article
The purpose of this paper is to present a revised classification of Paleozoic radiolarians at the genus level in the form of a series of plates displaying the images of the type species of each genus. These photos are supplemented by an indication of the status of the genus decided by an international team of specialists in this fossil group (Chapt...
Article
This chapter is to be used as companion text with the companion chapter, an illustrated catalogue of Paleozoic radiolarian genera found in this volume, and serves the purpose of giving the reader explanation for any taxonomic operations undertaken during the course of constructing the catalogue. These operations refer to the status of the genera as...
Article
The identity of presumed Terreneuvian (Stage 1, Fortunian) to Botoman (Series 2, Stage 3) radiolarians is discussed. The presence of radiolarians in the Lower Cambrian Hetang and Kuanchuanpu formations and the material from Jiuqunao, Hubei Province, China has to be regarded as a contamination with younger material. Oldest genuine radiolarians are r...
Article
Full-text available
Ordovician and Silurian glacial erratics of the Laerheide area (Lower Saxony, north-western Germany) bear well-preserved graptolites. The faunas provide important information on the origin and transport direction of the sediments preserved in a kame, representing the Drenthe stadial of the Saalian glaciation. The faunas even include species not com...
Chapter
There are a few characteristics that define a truly monograptid tubarium: the sicula with its aperture pointing in the opposite direction to the apertures of the thecae and the stipe growth. The presence of a single stipe or one with a variable number of cladial secondary branches, typically expressed in the genus Cyrtograptus, but also present in...
Chapter
Full-text available
The planktic graptoloids were probably the most unusual plankton that our planet has ever seen - huge colonial organisms swimming in the water column above their benthic cousins, the dendroids. The lifestyle of benthic graptolites may be understood by investigating the environment in which modern Rhabdopleura lives. Obviously, the life mode of a pl...
Chapter
Graptolites are biological enigmas of the first order. The planktic graptolites in particular provide splendid examples of evolution. Their evolutionary changes can be followed, often stratum by stratum, through the geological column. In a practical sense, the mechanisms that drove and shaped graptoloid evolution might be thought immaterial. Grapto...
Chapter
This chapter discusses a few of the scientists working with fossil and extant pterobranchs, hopefully to provide the faces behind so many publications. In the late 1840s to 1850s, graptolite research was finally gaining more interest and the first detailed taxonomic descriptions appeared in Europe and North America. During the late 19th century and...
Chapter
Graptolite taxonomy leads us back to the oldest descriptions of graptolites, but these are obviously simple and often not very precise due to lack of knowledge. The main problem of any taxonomic concept in paleontology is the interpretation of morphological characteristics, the only characteristics available in the fossil record. The taxonomy and e...
Chapter
Taphonomic information from hemichordates, and especially from pterobranch or graptolite fossils, provide important clues as to the lifestyle, ecology, death and burial of these fossil organisms, but also for the subsequent geological history of the surrounding rocks. All characteristics of the preservation need to be explored in some detail during...
Chapter
Scientists have collected graptolites for more than 150 years and quickly discovered their scientific usefulness. Graptolites might be easy to spot on shale surfaces, but often the contrast with the surrounding sediment is low and the specimens are only visible under special light conditions. Although some specimens are completely exposed after the...
Chapter
The graptolites long rested among various groups of benthic, colonial organisms before their real phylogenetic relationships were finally realized and understanding of these organisms became settled. They are now placed among the Hemichordata, where they are included as the subclass Graptolithina. The Graptolithina, as the second and more important...
Chapter
Graptolite research does not stop with the work on biostratigraphy, but goes far beyond it in its application in the geological sciences. Certain fossils are restricted to certain rock intervals, and paleontologists have worked out a general succession of faunas since the 19th century. Unlike many microfossils, graptolites are rarely reworked by er...
Chapter
The influence of the Great Ordovician Biodiversification Event (GOBE) on the evolution of the graptolites can be recognized and interpreted only indirectly from the fossil record. Early planktic graptolites were multiramous, with pendent to declined colonies, strongly mimicking their benthic ancestors. The a cladistic analysis of many early plankti...
Chapter
The planktic lifestyle has some advantages for the pterobranchs, especially the gain of new ecospace to explore. Anastomosis is another way of keeping strict distances between the stipes and stabilizing the graptolite tubaria. All benthic graptolites were attached to the substrate and fixed to a certain place for life. Benthic, dendroid graptolite...
Chapter
Full-text available
The term Axonophora describes graptolites with an axis and is based on a translation from the Greek language. The distal development of the nema in graptolite colonies has often been identified as the virgula, especially in the Monograptidae. The axonophoran sicula is very similar in its construction to the sicula of the earlier graptoloids. The vi...
Chapter
Benthic graptolites need a hard surface for attachment, as they have to be permanently fixed to the substrate. This chapter talks about the Graptolithina, include all taxa, both benthic and the derived planktic graptolites. The Rhabdopleuridae includes the best-known benthic graptolites and the only living members of the Graptolithina. As the speci...
Chapter
The terminology of the graptolite tubarium has been developed over centuries of research, although some of these terms have changed considerably since the first mention of these animals. All graptolites, by comparison with the living Rhabdopleura, produced an organic housing construction from glandular regions on their cephalic shield. The earliest...
Chapter
Full-text available
Initially, the retiolitid graptolites and other constructionally similar graptolite taxa were just lumped together as the Retiolitidae, because of the apparent lack of thecal walls and the presence of the meshwork of lists, masking the evolutionary relationships of 'retiolitid' graptolites. The secondary wall construction of the Retiolitidae includ...