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Durante el año 1972 y parte de 1973 se estudió la zonación biocenológica en la orilla rocosa maciza del Departamento de Lima, entre los 10°45'38"S y los 12°57'39"S, con la finalidad de establecer el esquema de zonación aplicable, entre los diversos esquemas empleados en otros lugares del mundo. En siete lugares guía, se delimitaron los niveles de pleamar y bajamar de sicigias y cuadraturas, para determinar la distribución vertical de los organismos, asociaciones y comunidades que integran la biocenosis de este tipo de orilla, caracterizando los diversos niveles de la zona entre mareas. Se encontró aplicable el siguiente esquema zonacional, modificado de Stephenson y Stephenson (1949): La ZONA LITORAL se extiende desde el nivel superior de Littorina peruviana, hasta el nivel promedio de las bajamares de sicigias ordinarias (MLWS = 0 m), y comprende: a) Franja supralitoral, extendida entre el nivel superior de Littarina peruviana y el límite superior de Chthamalus cirratus. b) Zona mediolitoral, extendida desde el límite inferior de la franja supralitoral hasta el nivel superior de Megabalanus psittacus; y la Franja infralitorol, comprendida desde el nivel inferior de la zona mediolitoral hasta la línea de bajamares medias de sicigias ordinarias., Biocenological zonation along the rocky shore of Department of Lima, Peru, were studied in 1972 and part of 1973 in order to establish a scheme of applicable zonation among others most used around the world. High and low water levels of spring tides and neap tides were delimited in seven areas selected as guide, in these areas have been determinate the vertical distribution of organisms, associations and communities characteristics in such subdivision of the intertidal zone. Stephenson and Stephenson's model of zonation was found applicable with certain modifications: The LITTORAL ZONE extends from upper level of Littorina peruviana to the mean level of ordinary low spring tides (MLWS = O m), and includes: (a) Supralittoral fringe, extends from the upper level of Littorina peruviana to the high level of Chthamalus cirratus.(b) Midlittorol zone, extends from the lower limit of supralittoral fringe to the upper level of Megabalanus psittacus; and (c) Infralittoral fringe, extends from the lower limit of the midlittoral zone to the mean line of ordinary low spring tides.

The primary objective in doing this work was to become acquainted with as many forms as possible of the marine fauna of the intertidal zone and if possible to determine some of the environmental relationships which exist in as many different types of habitats as possible.Due to limited amount of time spent in this study no very intensive work could be done and only a general survey was made of the more conspicuous forms of life which were encountered. Most of the work consisted of collecting and observing animals in the tide pools during periods of low tides. The animals collected were then taken to the laboratory and observed and determined as to species. Notes were taken as to place, time, and situation under which the animals were found.As many different types of habitats as possible were visited which included rocky intertidal areas of Mussel Point, Point Pinos, Lighthouse Point, Pescadero Point and Carmel Point just east of Carmel Beach. Sandy beaches were visited at Monterey Beach, Carmel Beach and Asilomar Beach. A marine estuary habitat was visited at Elkhorn Slough. More than two hundred species were identified and observed during this six-week period.A rather hasty population study was made of the eelgrass, Phyllospadix, of the intertidal zone at Mussel Point and of an algae, Gigartina caniculata, which grows at the level just above the eelgrass. Copyright permission signed by Fautin's daughter is on file with the IAMSLIC archive.