The Gortnabinna area contains a number of well-preserved, deformed burrows within the fluviatile Old Red Sandstone of S Ireland. Detailed logging of the local succession enables subdivision into four facies; Facies 1 represents sheet-flood deposits, Facies 2 ephemeral stream channels, Facies 3 marginal sheet-flood deposits and Facies 4 low-energy settling of fines. The burrows occur in Facies 1 and 4. The sediments are now folded into a large, upright, westward plunging anticline. The fold has a well-developed axial planar cleavage and is extended along strike by listric normal faults. The burrows in Facies 1 were originally circular and orthogonal to bedding and reveal a N–S layer parallel shortening strain of 2:1 followed by a shear strain of 1.48 during folding. These burrows have a bimodal distribution of diameters with peaks in the ranges 50–80 and 110–170 mm. The burrows of Facies 4 are sub-parallel to the bedding plane and are generally curved, with a maximum width of 180 mm and lengths of up to 2.3 m. These burrows display passive infill following abandonment. The burrows are morphologically similar though distinct from Beaconites barratti, which has been described from elsewhere in the Old Red Sandstone, and are tentatively interpreted as lungfish burrows.
A review of the history of the genus Psilophyton is presented. Two new species with sporangia in organic connection, P. microspinosum and P. dapsile , are described. They are compared with Psilophyton ‐like plants from Maine and other previously described fertile species of this genus. Evidence from several species in the Trout Valley flora confirms the concept of this taxon as presented by Hueber and Banks. Data based on all sporangium‐bearing species of Psilophyton are outlined, certain evolutionary trends within the taxon are tentatively presented, and recommendations for the treatment of the numerous fragmentary species and future new species are suggested.
Beaconites antarcticus has recently been recorded in (?Middle-) Late Devonian fluvial siltstones or the McAras Brook Formation, Nova Scotia. Although previously noted in several North American Palaeozoic sequences the trace fossil has not, until now, been documented from Nova Scotia. Herein we note its occurrence and compare it to previously reported examples which occur in similar stratigraphical and environmental settings particularly from the British Isles and Antarctica.
RÉSUMÉ
On rapporte la présence de Beaconites antarcticus dans des siltstones fluviaux de la Formation de McAras Brook, du Dévonien tardif (?moyen) de la Nouvelle-Écosse. Bien que déjà connue dans plusieurs séries du Paléozolque de L’Amèrique du Nord, on n'avait auparavant Jamais documenté cette trace en Nouvelle-Écosse. Nous notons done ici son occurrence et la comparons aux nombreux exemples déjà recensés dans des cadres stratigraphiques et environnementaux similaires, plus particulièrement au Royaume-Uni et en Antarctique.
[Traduit par le journal]
Graptolites In black slate underlying volcanics along Eel River near Benton, 20 km south of Woodstock, New Brunswick belong to the Clonograptus tenellus Zone of the upper Tremadoc Series. They are essentially the same age as graptolites from the Cookson Formation of southern New Brunswick.
The Belle Lake Slate overlies the same volcanics, and on Belle Brook, 12 km southwest of Benton, contains graptolites referred to the Nemagraptus gracilis Zone of the Caradoc Series. The Belle Lake Slate correlates with an unnamed sequence of greywacke and slate in the Hayesville area of central New Brunswick.
The Ordovician volcanics and overlying sedimentary rocks are the sane general age as a limestone facies found to the east and northeast of Woodstock. The limestones were deposited in shallow-water at varying distances from volcanically active areas.
The presence of lithologlcally similar Lower Ordovician and older rocks in the Benton area of west-central New Brunswick and in the Cookson Formation of southern New Brunswick allows both areas to be included in the same suspect terrane.
RÉSUMÉ
A 20 km au sud de Woodstock (Nouveau-Brunswick) on trouve, dans une ardoise noire recouverte de roches volcaniques, des graptolites qui appartiennent à la zone Clonograptus tenellus de la série du Trémadocien supérieur. Ces graptolites datent essentiellement de la même période que les graptolites de la formation de Cookson du sud du Nouveau-Brunswick.
À 12 km au sud-ouest de Benton, le long du ruisseau Belle, les roches volcanlques mentionnées ci-haut sont recouvertes par l 1 ardoise Belle Lake qui contient des graptolites de la zone à Nemagraptus gracilis de la serle du Caradocien. L‘ardoise Belle Lake est correlée avec une séquence de grauwacke et d'ardoise que l'on retrouve dans la région de Hayesville au centre du Nouveau-Brunswick.
Les roches volcaniques ordoviciennes et les roches sédimentaires qui les recouvrent ont environ le même âge qu'un faciès de calcaire situe à l'est et au nord-est de Woodstock. Les calcaires ont été déposés en eau peu profonde à des distances variables d'une région volcaniquement active.
La présence de roches lithologiquement semblables, certaines datant de l'Ordovicien inférieur, d'autres plus anciennes, dans la région de Benton au centre-ouest du Nouveau-Brunswick et dans la formation de Cookson au sud du Nouveau-Brunswick presuppose une pa renté entre les deux régions.
[Tradult par le Journal]
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