Considering the designation of the geological sites proposed in many geologic and geographic literatures (Wimbledon et al., 2000 [15] , Reynard et al., 2007 [16] , Iosif, 2014 [23] , Giusti & Calvet, 2010 [24] and Golonka et al. 2014 [25] ) and the main works of Ielenicz, 2009 [26] and Lugeri et al. [27] , which distinguished the geotope/ geosite to the geomorphosite in order to classify the tourist value of the site; Table 1 was established as a classification flow of geological features adopted in this present work. This classification is more flexible and easy to use in the field; in addition it can be used for complex geosites not only the rare geosites but also geosites with noticeable changes over a short-time period.

The inventory of geosites, paleosites and geomorphosites are crucial and very important for the purpose of integrative regional development ( [7] [28] - [30] ).

This work focuses on Isalo National Park, a park that is already protected. The preliminary approach to the implementation process of geoconservation shows without any doubts the abundance of natural heritage within the park, particularly the geosites [14] .

Taking into account all relevant bibliographical revision which aim to recognition of every possible geosite inventories, the methodology of this paper is based on different approaches suggested by many researchers ( [16] - [22] , the Italian Superior Institute Superior for Environmental Protection and Research (ISPRA: “Istituto Superiore per la Protezione e la Ricerca Ambientale”) and Madageoheritage. Accordingly, Madageoheritage has

proposed the prototype sheets of geosites/geomorphosites/paleosites inventories of Madagascar [5] . Because of many similarities between geosites found in Madagascar and abroad the inventory sheets were inspired from the descriptive sheets of ISPRA and were modified to fit the Malagasy geosites (recording more detailed characteristics and focusing more on the rarity and complexity of Malagasy geosites).The sheets were also designed for both previously known and unknown (potential) geosites and will be used by the Madagascar National Parks (MNP) at Isalo National Park [31] . The inventory sheets can assess the distribution of geological sites within the national parks and they can be used to categorize the sites according to their scientific and touristic values. Geosites of scientific importance can be valued as educational sites and those with tourism value can be used to promote geotourism; both will help to reduce local poverty.

The sheets were constructed using Canevas 12 software and were designed to be used in the field (Figure 1) and to be converted into a digital format (Figures 5-7) for the compilation of digital database.

Inventory sheet number one

Figure 2 shows all information and criteria used in the inventory sheets followed by explanation in order to compile the general data on the geological site:

Ÿ Information of the protected area and the geological site: property, toponym, location coordinates; identification code and the compiler.

Ÿ Detailed graphic presentation of the geological site: picture and geological map.

Ÿ Scientific interest which generate the assessment, contextual interests and scientific interest degree.

Ÿ Compiler: name of the compiler or symbol of the institution (university; association, NGO...) (e.g. Madageoheritage).

Inventory sheet number two (Figure 3)

The sheet is divided mainly into two parts, except the header, which is the same for all cards.

Ÿ On one side, the description of morphogenesis of the site. Under this strand are defined geological values of the site: general and genetic description, lithology and morphogenesis.

Ÿ On the other side are all of the characteristics of the site: typology (single or combination of elements); Structure of the area (e.g. punctual, panoramic); originality; the position of the site (in surface or submerged); accessibility (on foot, vehicle, bike or other): degree of accessibility (easy, hard, inaccessible) and season suggested for the visit.

Inventory sheet number three

Figure 4 represents the inventory sheet number 3 and is designed to collect any other secondary information of the site:

As parts of the process of geoconservation and protection of potential geosites, details description of sites are required and maximum amount of information are needed [27] , therefore the inventory procedure progressively followed the following steps:

- Data acquisition and collection, in which the methodology approach of the study were compiled with most of the data collected during site fieldworks.

- Data compilation using spatial data analysis (GIS) based on geological, geomorphological, geodiversity and biodiversity. This provides more scientific and touristic details about the sites and improves the geological map of Isalo National Park. This step usually starts with the scanning of filled sheets from the field.

- Inventorying geotopes according to their code, and that will be included in a Madagascar database (e.g. geotopes database of national parks).

Final compilation: this database compiled by a software will be hosted in a plat-form.

According to all information gathered in each inventory sheet, the identification and inventory, add more details explanation and understanding of the potential geosite/paleosite/geomorphosite. Figures 5-7 are examples of completed sheets. The application of this inventory procedure is advantageous for Isalo park because the park is a protected area which hides numerous geological objects that can be seen on several angles as a touristic attractive object, recreational and educational. The main goal is that these should become more easier understood by the general public.

The proposed inventory sheets here may be used both as a check list (Figure 1) and as a database (Figures 5-7).

As check list, the inventory sheets could be used directly on the field in order to describe and formalize a site as a geo- and/or paleo-site. The sheets allow us to classify every geographic, geological, geomorphological information on a site. Also, these allow us to collect information such as accessibility and point of interest.

In contrast to the ISPRA format, our inventory sheets included a section to record any previous histories, myths and legends about the geosites. Randrianaly et al. 2015 ( [5] ), explains the importance of stories about geological and paleontological features. Knowing the histories, the myths or legends about the geosites helped the compiler during his or her approach with the native and the locals. To attract visitor (scientists or tourists) these historical values can be included in the geosite database and could be published in museums, libraries and even on the park websites.

As an example, one geosite located in the East of the park is illustrated in the Figure 6.

According these inventory sheets, we strongly affirm that inventory and evaluation of the geoheritage are the best way to tackle and to overcome the challenge associated with the implementation of the geoconservation in Madagascar. The completion of the inventory of geosites within the Isalo Park shows that geosites values are based in four criteria (Figure 8) [5] .

-The inventory of each geosite promotes its scientific values (rarity, integrity and diversity) [16] .

-The inventory data brings additional explanation of the geology for scientists and promote local and international tourism, and attract visitor [32] .

-Geosites could be used as additional esthetic, ecological and cultural values ( [33] and [34] ). For example, the deep canyon with evergreen forest in Isalo National Park is considered as a natural beauty because of the landscape and also known as a sacred/holy site.

-The potentialities of the sites highlighted the geotourism, a sustainable strategy towards the ecotourism for Madagascar, which may help to reduce poverty and may improve and create a more sustainable development.

These results showed that inventorying geosites are not only restricted to scientific researches but also help to promote the educational, socio cultural, ecological values of the park.