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| Registros recuperados: 21 | |
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| Umbgrove, J.H.F.. |
| As a member of the Expedition on board H.M. „Willebrord Snellius" Dr. Ph. H. Kuenen had the opportunity to collect a suite of corals from a marine marl, deposited in an old valley now elevated above sea level, near Mahammanale, on the island Talaud, to the North of Celebes. He kindly entrusted to me the identification of the collection, which is now in the National Museum of Geology at Leiden. The following list shows the 15 species, which could be identified, and their stratigraphical distribution. 1. Flabellum rubrum (Q. et G.), Miocene, Pliocene, Pleistocene, Recent. 2. Flabellum pavoninum Less. var. paripavoninum (Alcock), Recent. 3. Acanthocyathus grayi E.H., Miocene?, Pliocene, Pleistocene, Recent. 4. Caryophyllia spec. (probably the recent species... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1938 |
URL: http://www.repository.naturalis.nl/record/319362 |
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| Umbgrove, J.H.F.. |
| Als palacontoloog bij den Dienst van den Mijnbouw in Nederlandsen Oost-Indië verkreeg ik toestemming om in de maanden Augustus tot October 1928 op eigen gelegenheid een reis te maken naar de Togian eilanden in de Golf van Tomini, Noord-Celebes. Het Hoofd van het Departement van Marine te Batavia had mij de dankbaar aanvaarde gelegenheid opengesteld op 31 Augustus 1928 te Menado aan boord te gaan van het hydrographische opname-vaartuig der Gouvernementsmarine „Eridanus”, dat met H.M. „van Doorn” de herziening van de zeekaart der golf van Tomini ging beëindigen. De „Eridanus” stond onder commando van den luitenant ter zee 1e klasse, thans kapitein ter zee H. Spits. Ik zal nimmer de groote gastvrijheid en de voortdurende behulpzaamheid vergeten, die de Heer... |
| Tipo: Article / Letter to the editor |
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| Ano: 1939 |
URL: http://www.repository.naturalis.nl/record/505837 |
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| Umbgrove, J.H.F.. |
| Only one eruption of the island Una-Una (Gulf of Tomini, Northern Celebes), in 1898, has been recorded in historical time; it was described in 1902 by Wichmann (l. c.) after data gathered from different witnesses. No lava flowed out, it was an ash-eruption. During that eruption large mud streams, called lahars, descended along the slope of the volcano and some broad flat-bottomed valleys were eroded (Pl. 44, fig. 4) which are known so very well from some Javanese volcanoes, especially from Mount Kelut. With the latter Una-Una shows many points of resemblance, in shape, structure and in type of the latest eruption. Along one of the large typical lahar valleys we climbed the volcanoe starting near Kololio. Fig. 6 and 7 show the higher parts of our road,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1928 |
URL: http://www.repository.naturalis.nl/record/505743 |
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| Umbgrove, J.H.F.. |
| Op menig eiland van den Indischen Archipel zijn tertiaire bekkens van sterke daling en sedimentatie geconstateerd. In de literatuur is hun veelal de naam geosynclinaal gegeven. Hun geschiedenis kan als een afzonderlijk verschijnsel en als een afgerond onderwerp beschouwd worden, zelfs indien men de geschiedenis dezer tertiaire z.g. geosynclinalen zou willen opvatten als een onderdeel van de zoo veel langer durende en zeer ingewikkelde historie van dit resteerende deel der Tethys. Ofschoon ik hier niet in stratigraphische bijzonderheden zal treden, zal het toch niet te vermijden zjjn, zoo nu en dan bepaalde niveau’s van het tertiair aan te duiden. Ik gebruik hiertoe de bekende letterindeeling van het Indische Tertiair 1). |
| Tipo: Article / Letter to the editor |
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| Ano: 1933 |
URL: http://www.repository.naturalis.nl/record/505939 |
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| Umbgrove, J.H.F.. |
| It is well known that before the famous eruption of August 1883 took place, the island Krakatoa consisted of three volcanoes, the basaltic volcano Rakata and the andesitic volcanoes Danan and Perbuwatan. With the great explosion of August 28th of that year Danan, Perbuwatan and the northwestern part of Rakata were entirely destroyed. Since then a coral reef began to grow on the Northwestern slope of the Rakata ruïn at a spot called Black Point (Zwarte Hoek), a place where the basaltic lava of Krakatoa is exposed. |
| Tipo: Article / Letter to the editor |
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| Ano: 1928 |
URL: http://www.repository.naturalis.nl/record/505773 |
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| Umbgrove, J.H.F.. |
| In the bay of Emmahaven near Padang (W. Sumatra) is a small coral reef. On the North side of this reef a small, sandy island occurs called Pasir Ketjil. It has lately been surrounded by brick walls, besides which a stone pier has been built in a S.W. direction (cf. fig. 1, a map of 1899 and fig. 2 and 3, the present condition). Since the building of that pier, coral sand has accumulated against it on the S-side. This reef lacks shingle ramparts. From this situation of the sandy island with regard to the reef, and from the placing of the younger coral sand accumulations (A in fig. 3), it may be concluded that the maximal wind-effect is strongest from the direction of the open sea, about S.W. Data about the wind frequency kindly supplied by the director of... |
| Tipo: Article / Letter to the editor |
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| Ano: 1931 |
URL: http://www.repository.naturalis.nl/record/505892 |
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| Umbgrove, J.H.F.. |
| In thinsections of tertiary limestones from Borneo I studied numerous specimens of a new genus of foraminifera showing an interesting and rather complicated structure. The material belongs to the Geological Survey of the Netherlands East Indies („Dienst van den Mijnbouw in Nederlandsch Indië”) at Bandoeng, Java. Syntypes 1) are in the palaeontological collection of the „Instituut voor Mijnbouwkunde” at Delft. My thanks are due to Mr. A.C. de Jongh, formerly director of the geological survey in the East Indies, who kindly lent me these rocks. |
| Tipo: Article / Letter to the editor |
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| Ano: 1936 |
URL: http://www.repository.naturalis.nl/record/505922 |
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| Umbgrove, J.H.F.. |
| Aan de hand van een serie kaartjes wordt in deze studie gepoogd de ontwikkeling van den Indischen Archipel — verspreiding van land en zee, faciesgebieden, tijden van transgressies, plooiingsperiodes etc. — in pretertiairen tijd voor zoover mogelijk na te gaan. Bij het vermelden van feiten en van literatuur heb ik mij tot het minimum beperkt. Immers in den Martinfeestbundel¹) zijn o.m. de palaeontologische en stratigraphische gegevens over het pretertiair en tevens de vindplaatsen¹) samengevat, terwijl in Rutten’s „Voordrachten” de belangrijkste wetenswaardigheden, tot het jaar 1927, bijeengebracht zijn. De nieuwere literatuur is gemakkelijk genoeg te vinden in Wing Easton’s „Bibliographie”. Alle gegevens over Malakka zijn geput uit Scrivenor’s werk: „The... |
| Tipo: Article / Letter to the editor |
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| Ano: 1935 |
URL: http://www.repository.naturalis.nl/record/505632 |
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| Umbgrove, J.H.F.. |
| The geological history of the Krakatoa volcano, especially the eruption of 1883, is amply described in the great work “Krakatau” by R. D. M. Verheer (1885), the Report of the Krakatoa Committee (Royal Soc. London 1888) and in the publications of B. G. Escher (Handel. 1e Nederl. Indisch Natuurwet enschapp. Congres 1919). In the last named the history of the Krakatoa-volcano is clearly shown in a block diagram series, which Professor Escher kindly permitted me to reproduce here as text figure 1. Before the famous Krakatoa-eruption of August 1883 took place, there were three islands: Lang-eiland (Long island), Verlaten-eiland (Deserted island) and Krakatau (Krakatoa). |
| Tipo: Article / Letter to the editor |
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| Ano: 1926 |
URL: http://www.repository.naturalis.nl/record/505661 |
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| Umbgrove, J.H.F.. |
| In der obersenonen Mastrichter Tuffkreide finden sich kleine Zähne, die durch ihre glatten Kauflächen und die Furchen an den Seiten des oberen Teiles an Kauplatten von Myliobatis erinneren, einen Rochentypus, der ein an durophage Lebensweise angepasstes Gebiss hat. Niemals findet man aber die für diese Familie so typische langgestreckte Form der Zahnplatten; die Zahnoberfläche hat immer rhombische Form. Dames hat eine ausführliche Beschreibung von diesen Zähnen gegeben, die er für Reste eines Cestracion-artigen Namen Rhombodus Binkhorsti Haies hielt, dem er den gab. Ich möchte hier nur noch einige kurze Bemerkungen hinzufügen. Die Abbildungen (fig. 1) zeigen den typischen rhombenförmigen Umriss der Kaufläche (d). Die durch eine in der Richtung der kurzen... |
| Tipo: Article / Letter to the editor |
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| Ano: 1926 |
URL: http://www.repository.naturalis.nl/record/505911 |
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| Umbgrove, J.H.F.. |
| INTRODUCTION The coral reefs of the Togian islands grow up as steep barrier reefs and atolls. Moreover small fringing reefs occur along the islands. The geological structure of the islands, as well as the history and morphology of the reefs are treated in a separate paper 1). I will here mention only one of the striking features of the reefs. The reefs are situated in a zone, famous for the unruffled calm and undisturbed quiet of the sea, because they are protected from the influence of both monsoons. In a curve from West to North they are sheltered against the North monsoon by the Northern arm of Celebes; on the South of this group the Eastern arm of Celebes breaks the influence of the South East monsoon, which, blowing across the Banda Sea is only... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1940 |
URL: http://www.repository.naturalis.nl/record/318138 |
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| Umbgrove, J.H.F.. |
| Dr. Ph. H. Kuenen kindly entrusted me with a suite of corals collected by him on the island Flores during his cruise with the Expedition on board of H.M. „Willebrord Snellius”. The exact locality is North coast near Papang where the road Papang-Rioeng-Rawoe forkes, 550 m above sea level. Nine different species were collected. Among these is one new species, Fungophyllia millepunctata. Of one coral, a Porites, the species could not be identified with certainty, though it strongly resembles a Porites species from the Miocene Progo-beds of Java. From the other 7 corals the following data on their stratigraphical distribution are known. |
| Tipo: Article / Letter to the editor |
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| Ano: 1939 |
URL: http://www.repository.naturalis.nl/record/505719 |
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| Umbgrove, J.H.F.. |
| In his review of the palaeozoology of Java, K. Martin could in 1919, record 49 foraminifera from tertiary strata of Java, on the strength of a critical study of the existant literature, and especially on the strength of his own studies and knowledge of the above mentioned fossils (Bibl. 49). In composing the following list of the Foraminifera I have only been able to perform such a critical study for a few families. For the greater part, however, I have had to restrict myself to recording the results obtained by others, and even therein I have been obliged to restrict myself. |
| Tipo: Article / Letter to the editor |
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| Ano: 1931 |
URL: http://www.repository.naturalis.nl/record/505889 |
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| Umbgrove, J.H.F.. |
| A short time ago I described a new foraminiferal genus from the Tertiary of Borneo 1). I gave this genus the name of Heterospira. Mr. P. H. Oehser of Washington drew my attention to the fact that E. Koken as early as 1896²) had used the name Heterospira for a genus of triassic gastropoda from Hallstatt. Therefore according to the international rules of zoölogical nomenclature, the name Heterospira for a foraminiferal genus being a homonym has to be rejected. |
| Tipo: Article / Letter to the editor |
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| Ano: 1937 |
URL: http://www.repository.naturalis.nl/record/505880 |
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| Umbgrove, J.H.F.. |
| INTRODUCTION In the Bay of Batavia there are patch-reefs and cays in different stadia of development. Some are small reefs still rather deep below sea level, other reefs bear a small sand cay. On the larger coral sand islands vegetation has developed ; moreover shingle ramparts and a moat have come into existence. The islands and reefs considered in this paper are situated South of a line which may be thought passing from Cape Pasir towards the Island Edam, so forming a boundary between the reefs in the Bay of Batavia and the northern group of Thousand Islands („Duizend eilanden"). The author studied these reefs in some detail and the results were published as early as 1928 1). In that amply illustrated paper data and considerations may be found on... |
| Tipo: Article / Letter to the editor |
Palavras-chave: 42.72. |
| Ano: 1939 |
URL: http://www.repository.naturalis.nl/record/318310 |
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| Umbgrove, J.H.F.. |
| Het is vooral door de onderzoekingen der Siboga-expeditie in Nederl. O.-Indië bekend geworden welk een groot aandeel kalkalgen hebben aan den opbouw van riffen (1). De Siboga trof meermalen uitgestrekte rifvormingen aan, die voornamelijk uit Lithothamniën opgebouwd zijn; een bank bij Salyer b.v., die als „koraalbank” op de kaarten vermeld stond, bleek geheel uit opeenhoopingen van Lithothamnium en Halimeda te bestaan; van Haingsisi (S.W. van Timor) wordt een bank vermeld, die nagenoeg uitsluitend uit één soort: Lithothamnium erulescens is samengesteld. In vele gevallen is gebleken, dat kalkalgen nog in grootere mate dan koralen tot de vorming van riffen bijdragen. Zoo is Gardiner door waarnemingen op Funafuti, Fiji, de Chago's en Malediven tot deze... |
| Tipo: Article / Letter to the editor |
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| Ano: 1926 |
URL: http://www.repository.naturalis.nl/record/505785 |
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| Umbgrove, J.H.F.. |
| In 1928, when studying the genus Pellatispira 1), I found some sections of the foraminifer described below in a limestone from S.E. Borneo (no. 1446 B. 414). The foraminifer resembles Pellatispira in many respects, but the distal part of the test shows a different structure, consisting of a double arrangement of median chambers on either side of an equatorial system of pores. Because the material was insufficient I put it aside. Some time afterwards a more intense study was made possible, as another limestone from S.E. Borneo (no. 1408 B. 404) was crowded with the same interesting species. It was, however, not before now that I had the opportunity of finishing this study and to publish the results. I now describe this foraminifer as Biplanispira absurda.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1938 |
URL: http://www.repository.naturalis.nl/record/505753 |
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| Umbgrove, J.H.F.. |
| De uitgestrekte grindafzettingen der Pleistocene Maas-delta vormen het typische plateaukarakter in het Zuid-Limburgsche landschap. In de dalen, die de latere loop der Maas en haar zijrivieren hierin gesneden hebben, komt in de Zuidelijke helft het Senoon aan den dag. Het grinddek van dit z.g. hoofdterras 1) zakt begrijpelijkerwijze langs de dalhellingen naar beneden en vormt een kapvormige bedekking over het Senoon heen. Waar plaatselijk nog resten van Tertiair (Pliocene-mariene zanden) aanwezig zijn, worden deze zoodoende geheel verborgen en is hun aanwezigheid (in dit gedeelte) alleen uit groeven en boringen bekend. Met uitzondering van enkele diepe groeven op het plateau zelf is dus alleen in de dalen het Senoon ontsloten en wordt daar nog op menige... |
| Tipo: Article / Letter to the editor |
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| Ano: 1925 |
URL: http://www.repository.naturalis.nl/record/505992 |
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| Umbgrove, J.H.F.. |
| Behalve uit de koralen, die ik ter plaatse verzameld heb, werd het studiemateriaal samengesteld uit de verzamelingen der Rijks-Geologische Musea der Universiteiten te Leiden, te Utrecht en te Groningen en uit die der Landbouwhoogeschool te Wageningen. Verder uit de collectie van Teyler’s Stichting te Haarlem, van het Natuur-Historische Genootschap in Limburg en de Stadsverzameling in het „Athenaeum”, beiden te Maastricht. Bovendien heb ik de uitgebreide collectie van het Musée Royal d’Histoire Naturelle te Brussel en de origineelen van Goldfuss te Bonn, ter plaatse mogen bestudeeren. Een doorzoeken der Universiteitsverzameling te München en der Technische Hoogeschool te Delft leverde mij geen nieuw materiaal meer. Van elk der beschreven soorten kon ik... |
| Tipo: Article / Letter to the editor |
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| Ano: 1925 |
URL: http://www.repository.naturalis.nl/record/505741 |
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| Umbgrove, J.H.F.. |
| The Coral Reefs of the Spermonde Archipelago (S. Celebes). 1. — The coral reefs of the Spermonde archipelago, West of Makassar (S. Celebes) are distributed over a submarine plateau, the so called Spermonde shelf, which to the landward side, gradually passes into the coastal plain of Makassar and Maros. To the East of Maros tertiary limestone mountains form the boundary of this plain; up till now we know Eocene and Miocene marine strata from these mountains. At the foot of these limestone mountains we find fossil coves about 30 meters above the present level of the sea, probably caused by a pleistocene abrasion and thus showing a pleistocene or postpleistocene negative shift of the strandline of about 30 meters. The coastal plain consists of volcanic... |
| Tipo: Article / Letter to the editor |
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| Ano: 1928 |
URL: http://www.repository.naturalis.nl/record/505609 |
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| Registros recuperados: 21 | |
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