EN:

The southeastern coast of Cape Breton Island from Gabarus Bay to Framboise Cove has been investigated as a typical example of a drumlin coast. Landforms have been mapped from ground observations and air photographs. Time series of coastal profiles of both beaches and eroding drumlin cliffs have been measured. Nearshore sediment distribution has been mapped. An analysis has been made of wind and wave frequency and direction data.

Four coastal segments are distinguished: (1) the south coast of Gabarus Bay has rock-cored drum-11ns separated by small barrier beaches; (2) the coast around Winging Point has a relatively stable depositional tombolo coast; (3) Fourchu Bay and Framboise Cove are developed in an area of thick till drumlins, and consist of barrier bars backed by lagoons and drumlins; and (4) the Fourchu Head and Red Cape are rocky coastlines from which all till has been removed by marine erosion,

The geomorphologlcal evolution is a consequence of the initial drumlin landscape, the availability of a wide range of sediment sizes, and the type and intensity of marine erosion processes including the effects of transgression. Two types of coast are developed: a) in irregular hilly areas, where the till is thin and occurs in rock-cored drumlins; and b) in valley areas, where thick till drumlins are found. In each of these types, three stages of coastal development are distinguished. These represent the effect of differing rate of maturation, dependent on the configuration of drumlins and varying type and intensity of marine erosion.

FR:

Depuis la baie de Gabarua jusqu'a l'anse Framboise, la cote sud-est de l'tle du Cap-Breton a ete etudiee en tant qu'exemple type d'une cote a drumlins. Les formes de relief ont ete cartographies a partlr d'observations sur le terrain et de photographies aeriennes. On a mesure a differents intervalles de temps, des series de proflis cotiers comprenant des plages alnsi que des falaises de drumlins soumlses a 1'erosion. La distribution des sediments littoraux a StS cartographlee.

On distingue quatre environnements cotiers. Le littoral sud de la bale de Gabarus est caracterise par des drumlins a noyau rocheux separes par des plages barrleres de faibles dimensions. La cote a tombolos qui entoure la pointe Winging est un envlronnement de deposition relatlvement plus Btable. Dans les regions de la baie Fourchu et de l'anse Framboise, des drumlins constitues d'un till epais sont 2 l'orlgine d'une cSte barriere appuyee par des langunes et des drumlins. Les cotes rocheuses du cap Fourchu et de Red Cape ont ete denudfies de leur till par 1'action erosive de la ner.

L'evolution geomorphologique de la cote ressort du paysage a drumlins original, de la disponibi-litS d'une vaste gamme de sediments, ainsi que du type et de l'intensite des processus drerosion marine, y compris les effets de la transgression. On reconnect deux types de cotes: l'une aar-acterisee par un paysage seme de collines oiil'on retrouve un till mince associe & des drumlins 2 noyau rocheux; 1'autre, que l'on retrouve dans les vallees, se distingue par d'epais drumlins constitues de till. Chacun de ces types de cotes se developpe en trois Stapes correspondent a des regimes de maturation differents qui dependent de la configuration des drumlins ainsi que de 1'intenBite et du caractere particuller de 1'erosion marine.

[Traduit par le journal]

EN:

The Mavillette Intrusion is a small gabbroic body located in Digby County, southwestern Nova Scotia. It is dyke-like in form, trending about 150°, with a strike length of at least 1250 m and a width of about 100 m. The igneous mineralogy includes oligoclase-andesine and augite, with accessory magnetite, ilmenite, and apatite, but the intrusion has undergone variably intense alteraLion/low-grade metamorphism and shearing, and secondary minerals are abundant. In chemical composition the intrusion is highly evolved but probably of continental tholeiitic affinity. It differs from other mafic igneous rocks of southern Nova Scotia, but on the basis of geographic location, mineralogy, and chemistry is considered to be related to the volcanic rocks of the White Rock Formation in the Cape St. Mary's — Yarmouth area. This correlation implies a late Ordovician— early Silurian age for the intrusion.

FR:

L'intrusion Mavillette est une petite masse gabbrolque situSe dans le comte de Digby au sud-ouest de la Nouvelle-Ecosse. Elle adopte la forme d'un dyke d'une largeur d'envlron 100 m et suit une direction d'aziraut 150 sur. une longueur d'au molns 1250 m. La nlneralogle ignee comprend des plagioclases (oligoclase-andesine) et de 1*augite, avec comme mineraux accessoires de la magnetite, de 1'ilmenite et de 1'apatite. Les mineraux secondaires sont trSs abondants car 1'intrusion a subl les effets varies d'une alteration intense et d'un mStamorphlsme lSger, accompagnfis d'un cisalllement. La composition chimlque de 1'intrusion est tres developple mais reflate probable-ment une affinite tholeiitique continentale. L'intrusion diffSre des autres rocheg Ignees mafiques du sud de la Nouvelle-Ecosse, mais de par sa situation g€ographique, sa mineralogle et sa chimie, on la considSre reliSe aux roches volcaniques- de la formation White Rock qu'on retrouve dans la region de Cape St. Mary's - Yarmouth. Cette correlation donne a l'intrusion un Ige allant de l'Ordovlcien tardif au debut du Silurien.

[Traduit par le journal)